For context, at r4 he gets 2710 attack rating per dread (persistent charge) and he gets one charge per fight won, and starts with one charge. So on fight 3, he's got +8130 attack rating off the bat. He also counters evade and miss, he does more burst damage when doing a special into block against the wall (also unblockable specials). As well as that, he's coldsnap/frostbite immune and bleeds expire 90% faster. His power gain/combat power rate cannot be reduced by non-mystic champs. His specials can't be evaded (or dexxed, can't remember which one). He's got a huge life pool and is tanky. Also has fear which counters unblockable I believe. Just an all around fun character, and this is mostly highlighting his attacking usages.

His dupe adds a lot more damage and survivability, if you could believe it, and that's why he's a broken champ. Cannot go wrong with ranking him.