Crystal Elemental

Illumination. The crystal elemental sheds bright light in a 20-foot radius, and dim light for an additional 20 feet.

Magic Resistance. The crystal elemental has advantage on saving throws against spells and other magical effects.

Reflective Body. Most of a crystal elemental's body is smooth, reflective, and semi-translucent. Any spell or magical effect that takes the form of a ray that targets the crystal elemental has no effect on it. In addition, the ray has a 20% chance of being reflected back to the caster, who immediately suffers the effects. If effects of the ray require a target to make a saving throw, the caster may attempt it against their own spell save DC.

Multiattack. The elemental makes two attacks, which can be either slam or slash attacks.

Slam. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 4) bludgeoning damage.

Slash. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 4)