Maintenance for the week of January 19:
• PC/Mac: No maintenance – January 19
• NA megaservers for patch maintenance – January 21, 4:00AM EST (9:00 UTC) - 10:00AM EST (15:00 UTC)
• EU megaservers for patch maintenance – January 21, 9:00 UTC (4:00AM EST) - 15:00 UTC (10:00AM EST)
Who is responsible for the Abyssal Geysers?
The way it was described ('group content') made me think of Dolmens, which made me think of the Daedric alliance trio - Nocturnal, Mephala, and Clavicus Vile. But the picture with it looks like crustacean monsters:
...and that suggests to me it's the Maormer and/or the Sload.