Portalburster

s are enemies in Death's Gambit.

Description
Looks like a Chestburster from Alien

When you kill the one in Upper Amulvaro's Observatory it leaves a debuff on you that drains all stamina when rolling

Strategy
In Upper Amulvaro's Observatory it spits projectiles and summons portals that shoot projectiles that burst into smaller projectiles

At other times it casts a spell which will deal damage over time.