Heya good people.
I recently started playing Grim Dawn, and i’m loving it.
Im playing a sorc/demolitionist with the following build currently:
—> after grimcalc com build as i cant write links yet =/. /zhH38E
Being fairly new i have no idea where to go from here.
I am using fireblast (from the offhand reagent thingy) as my spammable attack, with canister bomb for normal aoe clearing and devastation for the dudes that just wont die. Overall i am pretty happy with the build, however as i am focusing mainly (solely) on fire, certain fire resistant bosses (such as one of the bosses on BoC) takes weeks to kill, and i usually end up dying because i make some mistake.
My question is, should i introduce a secondary dmg type, and if so - which?
I would have no problem reworking the build entirely, i have not yet respecced anything so that should be cheap, and i could probbaly live without canister bomb for some more awesome single target damage. I am currently farming elite looking for some legendaries, but i hate myself for not being able to kill the boss in BoC!.
So either i would like to get more boss single target damage, preferably a non fire element, or a way to debuff bosses so they become more vulnerable to fire, as Flash Freeze does nothing.
Any help would be greatly appreciated! 
Regards
mboas