Arcanivore

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Medium Monstrosity (magic-eater, evolution), Neutral Evil

Armor Class 16 (natural armor)

Hit Points 187 (22d8+88)

Speed 30 ft.

STR 18 (+4)

DEX 14 (+2)

CON 18 (+4)

INT 12 (+1)

WIS 14 (+2)

CHA 10 (+0)

Saving Throws Con +8, Wis +6

Skills Stealth +6, Perception +6

Senses darkvision 60 ft., passive Perception 16

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 Arcanivore has advantage on saving throws against spells and other magical effects.

Evolutionary Assimilation. The Arcanivore can consume magic items to gain evolution points. For each consumed item, it gains 1 Evolution Point. At 3 Evolution Points it unlocks a temporary bonus and at higher thresholds can gain additional powers as determined by the DM.

Actions

Multiattack. The Arcanivore makes three attacks: two Claws and one Arcane Siphon.

Claw. Melee weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 11 (2d6+4) slashing damage.

Arcane Siphon. Melee weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 14 (3d6+4) necrotic damage. The siphon drains magical energy from the target, empowering the Arcanivore. If it has accumulated at least 3 Evolution Points, this attack deals an extra 2d6 necrotic damage.

Assimilate Item. The Arcanivore consumes a magic item within 5 feet. The item disappears and the Arcanivore gains 1 Evolution Point. The DM tracks Evolution Points; at 3, it unlocks additional abilities.

Legendary Actions

The Arcanivore 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 Arcanivore regains spent legendary actions at the start of its turn.

Detect. The creature makes a Wisdom (Perception) check.

Tail Swipe. The creature makes a tail attack against a creature within 10 feet.

Arcane Shard Barrage (Costs 2 Actions). The Arcanivore unleashes a spray of magical shards in a 15-foot cone. Each creature in that area must succeed on a DC 16 Dexterity saving throw or take 9 (2d8) force damage, half as much on a successful one.

Environment Underdark

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Lore & Description

Appearance

A hulking, sinewy figure cloaked in shifting runes, the Arcanivore's skin seems to shimmer with fragments of broken artifacts. Its eyes gleam with trapped constellations, and its mouth tastes of iron and arcane dust. It stalks dungeons and ruins, devouring magic items to fuel its evolution, growing sharper sigils and new powers with each feast. It leaves behind a trail of pulsing arcane motes whenever it consumes a magic item.

Behavior & Origins

Legends tell of a creature born from a collapsed artifact—the heart of a failed spell that absorbed countless enchantments. It hunts for magic items, imbibing their power to grow. Each evolution grants it stronger magic, a more terrifying appetite, and the ability to sense magic in its vicinity. Adventurers who seek to slay an Arcanivore must either outlast its hunger or feed it to the brink by redirecting its appetite toward a powerful artifact.

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Generation Info

Original prompt:
"A creature that devours magic items to evolve."

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

Arcanivore

Actions

Legendary Actions

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Lore & Description

Appearance

Behavior & Origins

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