Glass Mephit

If the mephit would take any fire damage, it instead takes no damage and regains a number of hit points equal to the fire damage dealt.

The mephit may spend half its movement to pass through a Medium or larger reflective surface within 5 feet, entering or exiting an extradimensional mirrorspace resembling the space reflected in the surface.

If a mirrored surface containing the mephit ceases to be reflective, the mephit is expelled into the nearest unoccupied space.

When the mephit dies, it explodes in a burst of glass in a 10 foot radius. Each creature in the area must succeed on a DC 11 Dexterity saving throw or take 5 (2d4) slashing damage and have glass shards embedded in its flesh.

Until a creature removes the shards as an action, the creature loses 1 hit point for each 5 feet it moves.

Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 6 (2d4) slashing damage.

On a critical hit, the mephit may use its Invibility as a bonus action this turn, if available.

The mephit magically turns invisible until it attacks.

When the mephit is targeted with a spell of first level or below, it can may make a DC 11 Dexterity saving throw.

On a success, the mephit can change the spell's target to another creature within 15 feet of it.