been playing the game for about 10 hours and I have gotten to a boss that i simply cannot beat, I am far to under leveled.
Anyone got any good tips for Leveling up quick?

character / difficulty / boss?

best way to lvl up quickly is to run through highest lvl place you can over and over

I totally dissagree tbh.
Checked it out with a lvl 30 char, I gained alot more exp in 50 maps than I did in 105 maps. The char have 45k crit dmg so 105 maps are nothing.
So best is probably to level up Close the the clvl.