Colossus, Iron

A siege engineer’s nightmare, this giant machine emits noxious fumes from its grinding engine.

Iron Colossus CR 21/MR 8

XP 409,600
N Colossal construct (colossus, mythic)
Init –1; Senses darkvision 60 ft., low-light vision; Perception +11; Aura deadly fumes (30 ft.), selective antimagic aura (30 ft.)


AC 39, touch 1, flat-footed 39 (–1 Dex, +38 natural, –8 size)
hp 309 (23d10+183)
Fort +9, Ref +6, Will +7
DR 10/epic; Immune construct traits, fire absorption


Speed 50 ft.
Melee flail +35/+30/+25/+20 (6d6+20/19–20) or stomp +35 (6d6+30 plus pinning stomp)
Ranged 2 heavy ballistae +14 (4d8/17–20/×3)
Space 30 ft.; Reach 30 ft.
Special Attacks Mythic Power (8/day, Surge +1d10), Mythic quickening, pinning stomp
Spell-Like Abilities (CL 17th; concentration +19

3/daywall of fire (DC 16)
1/daydelayed blast fireball (DC 19)


Str 51, Dex 9, Con —, Int 5, Wis 10, Cha 14
Base Atk +23; CMB +51 (+59 sunder); CMD 62 (68 vs. sunder)
Feats CleaveM, Great Cleave, Great Fortitude, Greater Sunder, Greater Vital Strike, Improved Critical (flail), Improved CriticalM (heavy ballista), Improved SunderM, Improved Vital Strike, Power Attack, Toughness, Vital Strike M
Skills Intimidate +14, Perception +11
Languages Common
SQ alternate form, Mythic creation, Mythic resilience, siege tower


Alternate Form (Ex)

As a full-round action, an iron colossus can transform its legs into a massive, destructive track. Its speed becomes 80 ft., it can’t be tripped, and it gains a trample attack that deals 4d8+30 damage. It loses its stomp attack. It can resume its base form as a full-round action.

Deadly Fumes (Ex)

An iron colossus emits a 30-foot-radius cloud of poisonous gas, exposing creatures that start their turn in this area.

Deadly Fumes: inhaled—save Fort DC 21; frequency 1/round for 2 rounds; effect 1d4 Constitution damage and sickened; cure 1 save.

Fire Absorption (Ex)

Not only is an iron colossus immune to fire, but when targeted or hit by a spell or attack that would deal fire damage, it heals half the fire damage it would be dealt.

Selective Antimagic Aura (Su)

Spells with the fire descriptor and fire effects are unaffected by this field.

Siege Tower (Ex)

An iron colossus’s ballistae don’t provoke attacks of opportunity, and they reload themselves at the start of the colossus’s turn.


Environment any land
Organization solitary
Treasure none

Standing 80 feet high and weighing 500 tons, iron colossi are the ultimate weapons of war.

Iron Colossus Construction

The body of an iron colossus is constructed from hundreds of tons of iron, costing 100,000 gp.

CL 17th; Price 500,000 gp


Feats Craft Construct, Mythic Crafter, Mythic Tier or rank 8, antimagic field, cloudkill, meteor swarm, rusting grasp, wall of iron, wish; Skill(s) Craft (blacksmithing) DC 30; Cost 300,000 gp

Section 15: Copyright Notice

Pathfinder Roleplaying Game Bestiary 4 © 2013, Paizo Publishing, LLC; Authors: Dennis Baker, Jesse Benner, Savannah Broadway, Ross Byers, Adam Daigle, Tim Hitchcock, Tracy Hurley, James Jacobs, Matt James, Rob McCreary, Jason Nelson, Tom Phillips, Stephen Radney-MacFarland, Sean K Reynolds, F. Wesley Schneider, Tork Shaw, and Russ Taylor.

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