At some point i went to Derth in order to get the 2 bonus points from beating those 3 guys in the arena.
Thanks to the multiplication of the shot produced by the Slime Spit when it's maxed , it killed all 3 guys on the same turn as soon as they spawned to replace the previous guy killed !
And then the bug appeared, the last fighter the Arcane Blade guy despite dying was still in the Arena, each hit i would do would kill him again and again, but he didn't disappeared.
Very luck for me, the event was set as completed on his 1st death, and very lucky again, the portal to exit appeared in an available location, not under his feet (in which case it would have been impossible to exit)
