Grinnaux de Dzemael

Ser Grinnaux is a recurring boss in Final Fantasy XIV: Heavensward. He is first encountered in a solo instance battle during the quest "Divine Intervention", and latter reprises as the second boss of The Vault.

The Vault
Ser Grinnaux initially just uses marauder techniques, occasionally, using Rive to damage players in a line. Once his health drops to 50%, he'll knock everyone back as he transforms into his primal form. In this form, he uses AoE attacks in sweeping arcs, and can tear dimensional holes that inflict vulnerability up on any party member that comes near. He always uses Hyperdimensional Slash towards one party member, followed by a second in a random direction. After these two, he'll eventually use Faith Unmoving to knock players back, requiring careful positioning to avoid getting flung towards the dimensional tears.

As his health drops, he'll occasionally start using a Dimensional Rift attack that places a gravity orb in a circle area of effect. Those who step into it will be afflicted with Weight.