I think the Berserker kit from FFA is quite weak. It has the least DPS (Diamond Axe is 9 DPS, Iron Sword Is 9.6 DPS, Diamond Sword is 11.2 DPS + the levels of sharpness on the swords) so maybe a solution to this would be giving the diamond axe sharpness 3, which will make it do 11 damage. Also, maybe instead of it having a wooden sword with knockback 1, maybe the axe itself could have knockback 1, and maybe all of the armor on the berserker kit should have protection 1.