kruber i find to be the worst tank when fighting hordes and bosses, he dies way to fast compared to other heroes, i find the dwarf,wizard and handmaiden way better.
krubers only good if you can find the purple potion.
handmainden- can avoid damage completely with dodging and melee spear, and gets krubers ult for situation purposes.
-dwarf gets one free full absorption attack with and can tank boss like no other while also taunting the boss so your damage can easily deal with him in 10secs, which kruber gets 1 charge vs the boss? before it turns into a mess.
-melee wizard is just ridiculous at taking damage.
passivly give kruber 5% or 10% damage reduction for 5secs when he uses his charge.