The glabrezu’s spellcasting ability is Intelligence (spell save DC 16). The glabrezu can innately cast the following spells, requiring no material components:
Magic Resistance. The glabrezu has advantage on saving throws against spells and other magical effects.
Multiattack. The glabrezu makes four attacks: two with its pincers and two with its fists. Alternatively, it makes two attacks with its pincers and casts one spell.
Pincer. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 16 2d10+5 bludgeoning damage. If the target is a Medium or smaller creature, it is Grappled (escape DC 15). The glabrezu has two pincers, each of which can grapple only one target.
Fist. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 7 2d4+2 bludgeoning damage.