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Colossus of the Siege Towers

Gargantuan Construct (siege-tower), Neutral Evil


Armor Class 20 (natural armor)

Hit Points 325 (26d20+52)

Speed 20 ft. climb 10 ft.

STR 16 (+3)
DEX 14 (+2)
CON 14 (+2)
INT 10 (+0)
WIS 12 (+1)
CHA 8 (-1)

Saving Throws Con +6, Wis +5

Skills Athletics +7, Perception +4

Damage Resistances bludgeoning from nonmagical attacks; piercing from nonmagical attacks; slashing from nonmagical attacks

Damage Immunities poison

Condition Immunities charmed, exhausted, frightened, paralyzed, poisoned, stunned

Senses darkvision 60 ft., passive Perception 14

Languages Common

Challenge 12 (8,400 XP) Proficiency Bonus +4


Legendary Resistance (3/Day). If the creature fails a saving throw, it can choose to succeed instead.
Magic Resistance. The creature has advantage on saving throws against spells and other magical effects.
Regeneration. The titan regains 10 hit points at the start of its turn if it has at least 1 hit point.

Actions

Multiattack. The titan makes three attacks: Tower Slam, Ballista Volley, and Arc Sweep.
Tower Slam. Melee weapon Attack: +7 to hit, reach 15 ft., one target. Hit: 25 (3d12+6) bludgeoning damage. The fused siege-tower fist crashes down on a single target.
Ballista Volley. Ranged weapon Attack: +6 to hit, range 120/240 ft., one target. Hit: 15 (2d10+4) piercing damage. A massive ballista bolt is fired from the titan's limb, piercing armor.
Arc Sweep. Melee weapon Attack: +7 to hit, reach 20 ft., one target. Hit: 13 (2d8+4) bludgeoning damage. The titan sweeps its fused towers in a wide arc, striking a second target within reach.

Legendary Actions

The titan can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The creature regains spent legendary actions at the start of its turn.

Tower Slam. The titan makes a Tower Slam attack.
Ballista Bolt. The titan fires a ballista bolt at a target within range.
Overrun (Costs 2 Actions). The titan shifts its position up to 20 feet.

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Lore & Description

Appearance

A towering monstrosity forged from the fused hulls of ruined siege towers. Its body is a jagged cathedral of timber, iron, and stone—each tower fused into a segment of its torso, with wheels and landing platforms spiraling along its length like the ribs of a great, living war engine. Tattered banners hang from torn pennants that whip in the wind as if the creature itself breathes and watches. Its eyes are glowing embers set in a helm of hammered steel; spiked ram-like protrusions crown its shoulders, and between the towers you can hear the creak of rope, the grind of gears, and the faint clatter of distant chains as the beast moves.

Behavior & Origins

Born from a besieged fortress that refused to fall, this titan was raised by desperate artificers who bound together a hundred siege towers with iron sinews and sorcery. The Colossus rose from the battlefield as a living engine of war, its towers grinding and shuddering as it marched toward the walls it once defended. It seeks to engulf cities in siege, to fuse them into new citadels of iron and wood, and to grind away any who dare stand in its way. Loyal to no ruler, it answers only to the scent of burning timber and the thrill of a perfect, crushing breach.

Monster Image

Colossus of the Siege Towers

Generation Info

Original prompt:
"A titan made of fused siege towers."

Created: Feb 2, 2026
Modified: May 31, 2026

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