Nobby 4th or 5th tier and is mass fire good

Mass fire is a broken skill. It is a guaranteed 50% increase in damage against the enemy, and it splits up the damage into 2. So essentially you will see 2 numbers pop out. That is due to mass fire activating. The first shot does 100% dmg, and the second shot that follows does 50% damage i think… (dont know the exact values but it is somewhere like that). I personally upgraded him to level 5 anyways, and yes, there is a small reduction in damage, but it is convenient in the sense that once you hit Industrial Age, you do not have to grind xp and you can jut upgrade him to level 6 (where he gains his mass fire abilities back again, with a 50% no counterattack ability on top, and bonus stats)