I wish there was a way to kill myself if I needed to

For example, if i'm running old Cata dungeons for achievements, and I hurt the boss too much so he doesn't spawn any more adds and I can't get some annoying achievement. Fuck. Better wait while Maloriak throws potions at me for 24 minutes watching my health slowly crawl down. Oh yeah, and I'm passively healing more than he can do damage to me. Shit. My warlock can life tap herself to death, which is nice, but I wish there was some sort of game wide ability, or item, that could kill me for Quality of Life (or death). It would also help with getting stuck under the map, getting lost, being stranded, etc. opinions?