like EWB said, hard to get down there indeed, the mob possesses some Kobolds nearby which you have to kill, once you killed one he pops out (during which time you can hit him a bit) and then possesses another kobold, and overall there are 5 of them afaik, easy fight, that gem is rare drop though.
Four kobolds, and for each you kill, he loses 15%, then when you killed them all, you have to kill the possessive spirit itself which is then at 40%. Seems to be like 2 hour repop on it, maybe even lower.
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