Ple-Sen
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Have you been to the island from the expansion? Anyway, it has very good resistances to everything (including stagger), a ton of HP, an AoE sleep attack with its lantern, and an AoE instant-kill attack with its scythe (and those who die are sent straight to the rift). It attacks you in dark places and orients itself by your lantern and your allies' lanterns. And when you finally bring its HP down to a certain level, it runs away to attack again later. And, like many other monsters on the island, it attacks after difficult battles, attracted by the smell of death.