#cr20

Attributes

Large construct, lawful evil

Armor Class: 20 (natural armor)

Hit Points: 387 (31d10 + 217)

Speed: 45 ft.

STR: 23 (+6)

DEX: 8 (-1)

CON: 24 (+7)

INT: 5 (-3)

WIS: 12 (+1)

CHA: 1 (-5)

Saving Throws: STR +12, CON +13, WIS +7

Damage Resistances: cold, radiant

Damage Immunities: necrotic, poison; bludgeoning, piercing, and slashing from nonmagical attacks

Condition Immunities: charmed, deafened, frightened, paralyzed, poisoned, unconscious

Senses: passive Perception 11

Languages: Infernal; understands all the languages of the souls currently fueling it

Challenge: 20 (25,000 XP)

Proficiency Bonus: +6

Special Traits

Soul Fuel. The soul warden has a furnace at its core fueled by souls. When first encountered, the furnace has 20 (4d6 + 6) souls trapped inside.

Trapped souls power the soul warden's movement and actions, as well as some special abilities which require the specified number of souls to be spent. Spending a soul destroys it permanently.

If the soul warden is reduced to 0 hit points or dies, unless it has no trapped souls remaining, it automatically spends 1 soul to regain 14 (4d6) hit points.

Immutable Form. The soul warden is immune to any spell or effect that would alter its form.

Legendary Resistance (4 Souls). If the soul warden fails a saving throw, it can choose to succeed instead.

Magic Resistance. The soul warden has advantage on saving throws against spells and other magical effects.

Soul Burn (1 Soul). Any time the soul warden deals damage with a melee attack, it can add an extra 10 (3d6) radiant damage and change all damage dealt to magical damage.

Actions

Multiattack. The soul warden makes up to three melee attacks, one of which can be its clamp.

Clamp. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: the target is grappled (escape DC 19) and restrained. While a creature is grappled in this manner, the soul warden cannot target any other creatures with its clamp, but as a bonus action, it can use its clamp to squeeze the grappled creature, dealing 7 (2d6) force damage.

Hydraulic Fist (Recharge 5-6 or 2 Souls). Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 32 (4d12 + 6) bludgeoning damage, and if the target is a creature, it must succeed on a DC 17 Dexterity saving throw or be pushed 10 feet away from the soul warden and knocked prone.

Stomp. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 28 (4d10 + 6) bludgeoning damage.

Soul Beam (6 Souls). The soul warden fires a beam of energy from its furnace in a 60-foot line that is 5 feet wide. Each creature in the line must make a DC 19 Dexterity saving throw, taking 44 (8d10) radiant damage on a failed save, or half as much damage on a successful save. A creature reduced to 0 hit points by this beam is disintegrated, leaving behind anything it was wearing or carrying.

Soul Siphon (1 Soul). The soul warden regains 14 (4d6) hit points.

Reactions

Imprison Soul. When another creature is reduced to 0 hit points while within 20 feet of the soul warden, it must succeed on a DC 18 Wisdom saving throw or its body is destroyed and its soul is trapped inside the soul warden's furnace.

Legendary Actions

The soul warden can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The soul warden regains spent legendary actions at the start of its turn, or it can spend 3 souls to regain 1 spent legendary action at any time.

Soul Beam. The soul warden uses its soul beam.

Soul Siphon. The soul warden uses its soul siphon.

Strike. The soul warden makes a melee attack.

[id: monster stat block for the soul warden, depicting a mechanical creature with spider-like legs ending in spiked pistons, one claw arm, a body of dark metal, glowing circles around a half-dome head approximating eyes, and a furnace grate on its front]