In the Reef of Coirnav: (no data)
In the Buried Sea: (no data)
In Sanctum Somnium: Part of the third raid event in Sanctum Somnium, "Under the Sea" (see this quest entry for event and loot information).
In Sarith: Hits for a max ~11,000; summons; rootable/snareable.
In the Combine Dredge: (no data)