[GMS] Bowmaster lvl 18x kills Papulatus in 3:39 Min with Critical Adventurer Ring

This is correct. With the critical ring I hit random 30k non crits on blood harps and 115k on wild monkeys. That's their max HP, so yea it is 1 hit kill as long as the HP of the monster does not exceed the damage cap. The only regular monsters we have that hit the 200k HP+ mark would be crap in Neo city, yes?

EDIT: Just to clarify, I'm a Night lord so there is no doubt that it is the 1 hit kill skill that comes into play.

The number itself would exceed the damage cap, just like tempest does.