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An ultra-heavy mechanoid with an ultra-powerful hellsphere cannon. Made for siegebreaking, its hellsphere cannon takes time to charge up a shot, but can melt concrete and vaporize bone. The diabolus dissipates the hellsphere cannon's waste power in a heat column mounted on its back, which can pulse to ignite flammable objects nearby.
This mech's name comes from a thousand-year-old poem written by a Haspian monk who survived the erasure of his monastery. His religiously-tinged work describes a razor-bodied fiend pulsing with flesh-searing heat as it crushed scorched bodies under massive claws. The few who have faced a diabolus and survived tend to agree with this depiction.

Base Stats

Market Value
1600 Silver


Armor - Sharp
Armor - Blunt
Armor - Heat

Pawn Stats

Combat Power
Move Speed
2.4 c/s
Health Scale
Body Size
240 kg
Pack Capacity
140 kg
Carrying Capacity
300 kg
Filth Rate
Comfortable Temp Range
-100 °C – 250 °C (-148 °F – 482 °F)

Melee Combat

18 dmg (Blunt)
27 % AP
2.6 second cooldown
Average DPS


Crafted At
Large mech gestator
Required Research
High mechtech
Gestation Cycles
Resources to make
Steel 300 + Plasteel 300 + Signal chip 2 + High subcore 1

A diabolus (pl. diaboli)[1] is a mechanoid commander added by the Biotech DLC. It drops the signal chip, required to research further mechanitor technology.


One or more diaboli can spawn in mechanoid raids when sufficient raid points are available for them, however they are also involved in the mechanitor progression and can be specifically summoned by the player.

Summoning a diabolus requires a mechanitor and a powered comms console. Constructing a comms console requires the Microelectronics research. Unlike the buildings used to summon the other mechanoid commanders, the console is not consumed in the process.

When summoned, it will be accompanied by other mechanoids. The amount of other mechanoids depends on how many times you have summoned a diabolus before, and is independent of wealth, time, or colony progress. Eventually, you'll have to face multiple diaboli at the same time. They will crash down in a ship after a random amount of time ranging from a few in game hours to days. They will not attack immediately, but will instead act like a raid and "prepare" before launching their assault. The maximum size is reached after summoning the diabolus 8 times.


  1. 1x Diabolus, 3x militor
  2. 1x Diabolus, 4x militor, 2x pikeman
  3. 1x Diabolus with heavy shield unit, 7x militor, 2x pikeman, 1x tesseron
  4. 2x Diabolus with heavy shield unit, 10x militor, 3x legionary, 1x centurion
  5. 2x Diabolus with heavy shield unit, 10x militor, 5x scyther, 3x centipede (gunner)
  6. 2x Diabolus with heavy shield unit, 15x militor, 8x pikeman, 4x centipede (gunner), 1x centurion
  7. 2x Diabolus with heavy shield unit, 15x militor, 10x lancer, 5x centipede (gunner)
  8. 3x Diabolus with heavy shield unit, 15x militor, 10x tesseron, 6x centipede (gunner), 1x centurion

Like the other mechanoid bosses, after being summoned 8 times, the next summon will be the same as wave 6. The wave count is per playthrough, not per colony or map. If the Diabolus is summoned once on one map, summoning another on a second map will bring the second wave. The Archonexus colony reset does reset this progression.

Every diabolus will drop a separate signal chip, it doesn't need to be "the boss" of a wave, or even to come as a summon.


Diaboli can be gestated by a mechanitor at a Large mech gestator once the High mechtech research project has been completed. They require Steel 300 Steel, Plasteel 300 Plasteel, Signal chip 2 Signal chips, High subcore 1 High subcore and 12 gestation cycles taking 1,800 ticks (30 secs) each to initiate. They take up 5 bandwidth from their linked mechanitor.

Dead, friendly diaboli can also be resurrected at the large mech gestator using the "Resurrect ultraheavy mechanoid" bill. This requires the corpse of the friendly diabolus, Steel 150 steel, and 1 gestation cycle taking 1,800 ticks (30 secs) to initiate.


The diabolus is an ultra-heavy mechanoid. As mechanoids, every diabolus is immune to fire, Flame and Heat damage, and temperature extremes, despite having Comfortable Temperatures defined. They have 100% Toxic Resistance and Toxic Environment Resistance, making them immune to toxic buildup, rot stink and other toxic effects. They do not need to eat, rest, and have no mood. They will be stunned by EMP attacks for a time proportional to the EMP damage inflicted and will "adapt" and rendered immune to further EMP strikes for 2,200 ticks (36.67 secs). Diaboli have a 60% EMP resistance, meaning they are stunned for 60% less time.

Dead diaboli may be shredded at the machining table or crafting spot for Steel 50 steel and Plasteel 20 plasteel. However, these values are affected by mechanoid shredding efficiency, as well as missing parts on the diabolus.

Defeating a hostile diabolus rewards the player with a signal chip regardless of whether they were summoned or came as part of a raid. Studying one is required to research Standard Mechtech, and they can also be used to create various mechanitor gear, or even your own diabolus.

Friendly diaboli recharge in a large mech recharger, creating 5 wastepacks to go from empty to full charge. This totals in 25 wastepacks whenever the recharger's waste is filled up.


An enemy diabolus alternates between two long range attacks:

  1. Hellsphere cannon. When using this attack, diabolus will create a red circle around a target. This circle indicates where Diabolus is aiming. It is to be noted that unlike unlike almost every other weapon, the Hellsphere cannon will not track it's target while aiming and will instead keep aiming at the same spot. After a 450 ticks (7.5 secs) warmup, the cannon fires an extremely fast explosive projectile, which upon exploding will leaving a large radius of fire. The blast is slightly larger than the visual circle, so err on the side of caution. This attack only has a range of 18.9 tiles, but also has a minimum range of tiles.
    • The explosive projectile deals 800 Vaporize damage, increased to 1600 damage against passable structures and 3200 damage against impassable structures. As an explosive, it ignores cover and has 100% accuracy. This checks Heat armor, but has a massive % AP. However, due to the fact that Vaporise damage does not overflow, the majority of this damage often ends up overkilling just one or 2 body parts, leading to much lower effective damage output
    • Unlike other ranged weapons, once initialized, it will continue to fire, even if the diabolus is engaged in melee in the meantime. Engaging in melee will prevent future shots being initialized, but will trigger the flame burst discussed below.
  2. Charge blaster turret. This fires a single shot at relatively low damage and is affected by cover, but can do so from a very long range (44.9 tiles). It can also be fired while moving, and has almost no warmup time.

Diaboli have the ability to emit a "fire burst". Over a few seconds,[Detail needed] it surrounds itself in roughly 5.9 tile radius of flammable chemfuel puddles. Once complete, it releases a Flame explosion of the same radius, dealing damage and igniting the puddles.[Details needed] Enemy diaboli will trigger the burst when engaged in melee, even by enemies that are immune to fire like other mechanoids. Friendly diaboli must have their fire burst manually triggered by the player,[Verify] and have both a 3 second warmup[Verify friendly only] and a 2,700 ticks (1.08 in-game hours) cooldown after use.[Verify friendly only]

An enemy diabolus won't actively try to breach walls, and it will never appear in breacher raids. However, it will destroy buildings and objects, like any raider, if no pawns are accessible.


Kiting and spreading out is key to taking out the Diabolus. The biggest threat is by far its Hellsphere cannon, which can instakill almost anyone and anything. For reference, a pawn with the Tough trait, fire resistant gene, and wearing a legendary duster, formal vest Content added by the Royalty DLC / corset Content added by the Royalty DLC, and button down shirt made of devilstrand still has a 28% chance of immediately dying from torso damage. Players should instead prioritize avoiding the shot in any way possible, either by moving pawns out of the way, staying out of range, or by being too close to target with the cannon.

Be extra careful about fire; if not from the diabolus' blasts, then from the wildfires caused by them, or by the tesserons alongside it. Pawns lit on fire can't be controlled, so you can't order them out of the blast range, which is nearly certain to be fatal. Also be wary of the Fleeing Fire mental break, caused by being a child or having the pyrophobia gene. While short, it is still just as dangerous as any mental break with a diabolus. A firefoam pop pack is very helpful.

You should manually move pawns away from the blast radius, always allowing yourself the option to retreat. Split up your pawns, which will allow more of them to focus on shooting instead of running. You can even use your own militors to lure the cannon or flame burst; their range is short enough to justify staying close, anyway. It only has 1 non-flame attack, so even a cleansweeper can stall for some time.


Melee can be an effective tactic. But with fire vulnerable pawns, it is highly advised to NOT use melee attacks, due to the close-ranged burst. Sufficient fire protection (devilstrand clothing, phoenix armor,Content added by the Royalty DLC impids' fire resistance) can help tank the flames, and your own mechanoids are completely immune to fire. Firefoam makes your organic pawns immune to being lit on fire, but heat damage still applies.

Using EMP[edit]

Despite their resistance, diaboli are still vulnerable to EMP attacks. However because of the EMPs reduced uptime, you may want to use EMP damage tactically. Stunning the diabolus interrupts the hellsphere cannon, so EMPs can be timed to prevent the cannon from firing and potentially save a pawn's life. If the diabolus is still adapted while firing, and therefore temporarily immune to further EMP stuns, then this strategy cannot be used. EMP should thus be used sparingly, rather than fired at will.

The exception to this is once diaboli spawn with shields, which can be broken instantly by EMP. In that case it is usually better to use EMPs immediately rather than attempt to interrupt a blast. This will kill the diabolus faster, which prevents more hellsphere shots overall.

Psycasts Content added by the Royalty DLC[edit]

Diabolus, with its 0.75 sensitivity, is vulnerable to certain Psycasts. Beckon will interrupt either of its charged attacks, even if immediately broken by damage. Berserk on its ally can cause it to waste a lot of time on charging a friendly fire attack, which it cannot interrupt on its own. If cast on the diabolus itself, berserk will interrupt its charged attacks and prevent their usage for the duration of the cast.

Diabolus is too big to be affected by Skip psycast and its variants.

When you should fight[edit]

The first diabolus battle is a major hurdle for any mechanitor. For a solo mechanitor playthrough, a mechanitor armed with an assault rifle, 4-5 militors, and a small crew of labor mechs like agrihands are enough to take out the first diabolus, with the following strategies:

  • Spread out. Have each militor close enough to the enemies, and labor mechs ready to melee. Ideally, only 1 mech is in the hellsphere blast at a time.
  • Have your mechanitor & militors focus fire each enemy militor until they die. The faster the small mechs die, the less damage you'll sustain.
  • Have each labor mech melee a separate enemy. Militors in melee cannot fire their guns, reducing damage accordingly.
  • With the diabolus inefficiently firing hellspheres / flame bursts at your mechanoids, take it down. The pulse turret can still hurt, especially for the labor mechs, but it should die.

Alternatively, running the diabolus down 30-40 wood spike traps, or 10-15 steel spike traps, is enough to do the trick. A triple rocket launcher can be handy, but don't harm your own mechs!

With a multi-colonist colony, you can have each pawn wield a long-range weapon like the bolt-action rifle or assault rifle. Whenever you get into the hellsphere cannon's range, back off. You can combine this with the aforementioned mech strategies to be more successful. With just the pulse turret to worry about, the diabolus becomes about as strong as 2 pikemen (just with a lot more health).

Analysis - As an ally[edit]

Slow and with a little more health & armor than a Centipede, diaboli are best used against stationary threats like sieges, mech clusters,Content added by the Royalty DLC and other mech commanders as well as centipedes. The charge blaster turret is more of a gimmick, when the Diabolus slowly closes distance. It's faster than a Centipede, but not a lot: a speed of 2.4 c/s compared to 1.9 c/s.

But when it's close, it's a tank killer. The Hellsphere cannon is a devastating tool. It does 800 Vaporize damage with an AP of 100%, about 2/3 more than a antigrain warhead. It can easily one-shot or at least massively soften up even the strongest enemy mechanoids. While you can dodge enemy hellsphere cannon shots with some micro management thanks to it's long wind-up time, the enemy won't. They just stand there and get destroyed.

Watch out for the hellsphere cannon accidentally destroying items, including the chips dropped by all 3 mechanoid commanders.

Due to the efficacy of fire against Insectoids, the Diabolus can be an effective way to eliminate infestations, though this risks the Diabolus' own body if the Insectoids manage to destroy it, potentially preventing resurrection and wasting resources, and anything in the room, especially if the floor is made of a flammable material like wood.

When using the remote shielder, be very careful. If the shield is active when the hellsphere cannon, the shot will hit the shield, damaging the Diobolus and anything within point blank range.


Body Parts (Summary)[edit]

Part Name Health Quantity Coverage[1] Target Chance[2] Subpart of Internal Capacity[3] Effect if Destroyed/Removed
First body ring 247.5 1 100% 10% N/A[4] Ex.png Moving
−16.6% Moving
−16.6% Manipulation
Will never take permanent injury
Head 135 1 10% 3.4% First body ring Ex.png - Death
Will never take permanent injury.
Artificial brain 45 1 10% 1% Head Check.png Data Processing Death
Will never take permanent injury.
Sight sensor 45 2 8% 1.3% Head Ex.png Sight −25% Sight. −100% if both lost.
Will never take permanent injury.
Hearing sensor 45 2 8% 1% Head Ex.png Hearing −25% Hearing. −100% if both lost.
Will never take permanent injury.
Chemical analyzer 45 1 8% 1% Head Ex.png - Will never take permanent injury.
Bulb turret 180 1 5% 5% First body ring Ex.png - Will never take permanent injury.
Second body ring 247.5 1 75% 3.7% First body ring Ex.png Moving
−16.6% Moving
−16.6% Manipulation
Will never take permanent injury
Reactor 90 1 5% 3.8% Second body ring Check.png Power Generation Death.
Will never take permanent injury.
Hypercapacitor 225 2 10% 7.5% Second body ring Check.png - Will never take permanent injury.
Third body ring 225 1 70% 16% Second body ring Ex.png Moving
−16.6% Moving
−16.6% Manipulation
Will never take permanent injury
Fourth body ring 202.5 1 70% 15% Third body ring Ex.png Moving
−16.6% Moving
−16.6% Manipulation
Will never take permanent injury
Fifth body ring 180 1 60% 11% Fourth body ring Ex.png Moving
−16.6% Moving
−16.6% Manipulation
Will never take permanent injury
Sixth body ring 157.5 1 50% 10% Fifth body ring Ex.png Moving
−16.6% Moving
−16.6% Manipulation
Will never take permanent injury
Fluid reprocessor 67.5 1 5% 0.55% Sixth body ring Check.png Fluid Reprocessing Death
Will never take permanent injury
  1. Coverage determines the chance to hit this body part. It refers to the percentage of the super-part that this part covers, before its own sub-parts claim their own percentage. For example, if the base coverage of the super-part is 100%, and the coverage of the part is 20%, 20% of hits would hit the part, and 80% the super-part. If the part had its own sub-part with 50% coverage, the chances would be 10% sub-part, 10% part, 80% super part.
  2. Target Chance is the actual chance for each part to be be selected as the target when each part's coverage has been taken into account(I.E. Neck covers 7.5% of Torso but Head covers 80% of Neck so it actually has only a 1.5% chance to be selected). This is not pure hit chance, as different damage types propagate damage in different ways. See that page for details.
  3. Note that capacities can affect other capacities in turn. Only the primary effect is listed. See specific pages for details.
  4. This is the part that everything else connects to to be considered 'connected'.


Version history[edit]

  • Biotech DLC Release - Added.
  • 1.4.3527 - Fix: match diabolus fire burst range to its range overlay.
  • 1.4.3528 - Fix: Diabolus has two 'first' body rings.
  • 1.4.3530 - Fix: Comms console diabolus threat cannot be called by mechanitors if mech faction is disabled.
  • 1.4.3531 - Increased EMP resistance from 30% to 60%. Added alert for incoming bossgroup. Fix: Bossgroup mechs do not attack if mechanoid faction is disabled.
  • 1.4.3534 - Fix: Diabolus' fire burst shoots fuel through the walls.
  • 1.4.3541 - Fix: When the mechanoid faction is disabled, mech bosses will not attack pawns.
  • 1.4.3555 - Now immune to psychic lances. Super-mechanoids cannot be called when there is already another super-mechanoid on the way.


^1 - Cynapse - Ludeon Developer, Rimword Official Development Discord 22 Jan 2023