Siegewright War Engine

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Large Monstrosity (animated, siege), Lawful Evil

Armor Class 18 (natural armor)

Hit Points 171 (18d10+72)

Speed 25 ft.

STR 20 (+5)

DEX 12 (+1)

CON 18 (+4)

INT 4 (-3)

WIS 10 (+0)

CHA 6 (-2)

Saving Throws Con +7, Wis +3

Skills Athletics +8, Perception +4

Damage Immunities poison

Condition Immunities poisoned

Senses darkvision 60 ft., passive Perception 14

Languages Common

Challenge 10 (5,900 XP) Proficiency Bonus +3

Legendary Resistance (3/Day). If the creature fails a saving throw, it can choose to succeed instead.

Spirit Possession. A war spirit animates the engine, granting the following aura: While the engine has at least 1 hit point, allies within 10 feet gain advantage on saving throws against being frightened.

Actions

Multiattack. The siege engine makes two Hammer Smash attacks and one Cannon Fire attack.

Hammer Smash. Melee weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 19 (3d8+6) bludgeoning damage. A heavy blow from the grinding iron hammer. If the target is Medium or smaller, it must succeed on a DC 17 Strength saving throw or be knocked prone.

Cannon Fire. Ranged weapon Attack: +7 to hit, range 120/240 ft., one target. Hit: 18 (4d6+4) fire damage. A thunderous blast from the engine's front-mounted cannon.

Legendary Actions

The creature 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.

Spirit Burst. The spirit animating the engine channels raw war power, granting +2 to one attack roll this turn.

Hammer Toss. The engine hurls a broken hammer in a 20-foot line. Each creature in the line must succeed on a DC 16 Dexterity saving throw or take 13 (3d6) bludgeoning damage.

Cannon Volley (Costs 2 Actions). The cannon fires a second shot at up to one target within range, dealing 2d8 fire damage on a hit.

Environment Forest, Mountain

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Lore & Description

Appearance

A massive siege engine forged of black iron and bronze plates. Its wheels are studded with rune-bronze rivets, and a yawning maw of a viewport glows with greenish light. War-torn banners drag along its flanks; steam vents hiss as the engine breathes with a life of its own. The engine moves with an odd, patient rhythm, like a cataphract statue about to unleash a torrent of iron and fire.

Behavior & Origins

Unlike a mere construct, the Siegewright War Engine is a battlefield spirit's vessel. It was forged during a siege, infused with a war spirit that hungers for victory and revels in destruction. It follows a strict, almost military code, executing commands with cold efficiency. It respects orders, but it will seize control if those orders threaten its own life or the lives of its pilot crew. Adventurers might face it as a siege weapon brought to life on the battlefield: armored, weaponized, and seemingly sentient in its own grim way.

Generation Info

Original prompt:
"A living siege engine possessed by a war spirit."

Created: Feb 2, 2026
Modified: May 22, 2026