Read my Nuri's Hallows guide. It explains an easy way to avoid death by the death ring.
I will try to update it with the new stuff, however this is the update for Boggy Waters part. A sneak peak:
When, doing Snake Charmer in a dungeon with a full party, be sure to have a MAGE hide behind a pillar far away from Snake Charmer. This way, if he accidentally moves out from behind the pillar and kills everyone, the mage can simply step out, hit revive and prevent a walk back/boss reset.