Animated Puzzle Door

Family: Animated Objects

Large construct, unaligned

Armor Class 13 (natural armor)
Hit Points 230 (20d10 + 120)
Speed 0 ft.

STR	DEX	CON	INT	WIS	CHA
22 (+6)	6 (-2)	22 (+6)	18 (+4)	16 (+3)	10 (+0)

Skills Perception +6
Damage Immunities poison, psychic
Condition Immunities blinded, charmed, exhaustion, frightened, incapacitated, paralyzed, petrified, poisoned, prone, stunned, unconscious
Senses blindsight 120 ft. (blind beyond this radius), passive Perception 16
Languages
Challenge 7 (2,900 XP)
Proficiency Bonus +3

SPECIAL TRAITS

• Immutable Form. The door is immune to any spell or effect that would alter its form.
• Regeneration. The door regains 10 hit points at the start of its turn as long as it has at least 1 hit point. If it takes damage of a type it is vulnerable to, this trait doesn’t function at the start of its next turn. If the door is destroyed, it reforms and regains all its hit points in 1 hour unless a 7th-level dispel magic spell is cast upon its remains.
• Riddle of Vulnerability. At the start of each of its turns in combat, the door presents a riddle that has a specific type of damage as its answer. Until the start of its next turn, the door has vulnerability to that type of damage. Determine the type of damage and accompanying riddle by rolling a d8:
• Acid. My bane carves without tools and brands without heat, often thought the counter to sweet.
• Cold. My bane turns streams to roads and breath to steam, makes crystals that fly and shards that gleam.
• Fire. My bane has no lungs but needs to breathe, hasn’t a mouth but needs to eat.
• Force. My bane won’t cut, slash, or smash, but fly from mages fingers, leaving naught but ash.
• Lightning. My bane comes from darkness and skies that roil, yet is clear and bright as it strikes the soil.
• Necrotic. My bane withers flesh and snuffs out life, often wielded by agents of strife.
• Radiant. My bane pierces the dark, vivid and bright, banishes night and cleanses blight.
• Thunder. My bane cannot break but will often crack, has no hands but the loudest clap.

ACTIONS

• Multiattack. The door makes two Stasis Beam attacks.
• Stasis Beam. Ranged Spell Attack: +7 to hit, range 60 ft., one target. Hit: 15 (2d10 + 4) force damage and the target must succeed on a DC 15 Constitution saving throw or be restrained until the start of the door’s next turn.
• Gravity Wave (Recharge 5-6). Each creature within 20 feet of the door must make a DC 15 Strength saving throw. On a failed save, a creature takes 28 (8d6) force damage and is pushed up to 20 feet away from the door and knocked prone. On a successful save, a creature takes half as much damage and isn’t pushed or knocked prone.

BONUS ACTIONS

• Confounding Word. The door utters a confounding word aimed at a creature it can see within 30 feet of it that can hear it. The target must succeed on a DC 15 Intelligence saving throw or take 18 (4d8) psychic damage and be stunned until the start of the door’s next turn.
• Repelling Glyph. A glyph forms on the door’s surface until the start of its next turn. When a creature that can see the door starts its turn within 30 feet of the door or moves within 30 feet of the door for the first time on a turn, it must make a DC 15 Wisdom saving throw. On a failed save, the creature can’t move closer to the door until the start of the door’s next turn. A creature can avert its eyes to avoid the saving throw. If the creature does so, it can’t see the door until the start of its next turn.

REACTIONS

• Reflective Retribution. When a creature within 30 feet of the door hits it with an attack that only deals damage of a type (or types) that the door isn’t vulnerable to, the door reflects the strike back at the attacker. The door takes no damage and the attacker must instead make a new attack roll against its own AC, as its attack targets itself.

An animated puzzle door is as much puzzle as creature. Unable to move doing so would leave whatever it protects unprotected the puzzle door fights off intruders with gravity-bending magic and arcane glyphs.

Creatures with a penchant for riddles and a sharp mind will find the door easier to fight, as it continuously rhymes about what types of damage are most harmful to it. An animated puzzle door may be created on purpose, or be the result of an ordinary door with a puzzle on it that has been animated by proximity to wild and unstable magic.