(Reach 2) On damage: Grappled (escape DC 17). If the same creature is Grappled by both of the glabrezu's claws, it must escape from each of them separately.

(A creature Grappled by both of the glabrezu's claws) Unpreventable damage. If the target is at 0 HP: DC 17 STR save or be torn in two, dying instantly.