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It does 90...180 (or 95...190) dmg on naked, about 40...120 on unplated Stolen, Holidae reported 25...75 on Perseus (small sample).
It seems to have the same weird mix of damage types as common jellies, and also occasionally does that nasty jelly thing - two hits in rapid succession.
200 hp, Perseus, adj or better fapper and sufficient dps not to fall asleep should take you through solo. I however wouldn't try with my 145 hp and unplated Stolen.
I have 210 hp, martial sga/angel, regen chip VIII, so I am a little low on the requirements. I guess it does some acid.
Will ask for a team if others in my society want to skip merry mayhem too.