Cele usually isn’t recommended in dungeons where people want to speed run. It should be fine for more casual runs though.
Toolkit is a mostly PvP Kit (pull, cripple/bleed, shields and confusions are useless on mobs). Swap out the toolkit for FT. You get a blast finisher + fire field, and the damage isn’t half bad. Grenades are alright, thought for dungeons I prefer to run bombs for blast finisher + fire field. Smoke field is also great if you’re doing speed runs and want to skip mobs.