is the damage at the start just randomized 120-170? and sometimes i do 800 damage is that just a crit or is there any thing i do to trigger it
The exact amount of damage you do per-hit, per-attack is randomized within a certain range, depending on the attack. There is the possibility for crits as well, yes, which can bump it up a bit as well. Fairly standard RPG stuff. Makes it a little more interesting than doing the exact same damage every turn.