Magic Weapon Eater. The xenomimic is resistant to damage dealt by magical, silvered, and adamantine weapons.
Shapechanger. The xenomimic can use its action to polymorph into an object or back into its true, amorphous form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.
Adhesive (Object Form Only). The xenomimic adheres to anything that touches it. A Huge or smaller creature adhered to the xenomimic is also grappled by it (escape DC 13). Ability checks made to escape this grapple have disadvantage.
False Appearance (Object Form Only). While the xenomimic remains motionless, it is indistinguishable from an ordinary object.
Grappler. The xenomimic has advantage on attack rolls against any creature grappled by it.
Magic Resistance. The xenomimic has advantage on saving throws against spells and other magical effects.
Spellcasting. The xenomimic is a 5th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17, +9 to hit with spell attacks). The xenomimic can cast disguise self and invisibility at will and has the following wizard spells prepared:
Cantrips (at will): fire bolt, light, mage hand, prestidigitation, shocking grasp
1st level (4 slots): detect magic, identify, mage armor*, magic missile
2nd level (3 slots): detect thoughts, mirror image, misty step
3rd level (3 slots): counterspell, fly, lightning bolt
Multiattack. The Xenomimic uses it's Pseudopod twice, then it's Bite.
Pseudopod. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage. If the xenomimic is in object form, the target is subjected to its Adhesive trait.
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) piercing damage plus 4 (1d8) acid damage.
Pseudopod Spellcaster. If a creature the xenomimic can see moves away from it, the xenomimic can attempt to cast a cantrip or 1st level spell it knows at that creature, as long as they are within range of the spell.
Description
Bizarre Circumstance. A Xenomimic is created when a particularly powerful wielder of the arcane decides they want to actually use a mimic as a chest. Never once has this ever worked, often leaving these powerful spellcaster to destroy their creations.
On occasion, however, the mimic is left alive. Whether they were simply forgotten or ignored, they continued to live, slowly digesting the magical objects, arcane scrolls, or enchanted armaments which were left within them.
Eventually, the mimic is transformed into a Xenomimic - a far more dangerous, far more intelligent form of life than it's previous state. Xenomimic horde knowledge and magical objects the way a dragon might, making them both extremely rare and extremely dangerous.
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