The Champ

The Champ is one of three Act 2 boss enemies with 420/440 HP, the highest HP of any Act 2 boss. In Phase 1 he uses a variety of attacks including Heavy Blow, Face Slap (Vulnerable + Weak), Gloat (Strength buff), and Execute. When reduced to 50% HP, he cleanses all his debuffs, gains 6/9 Strength (normal/ascension), and Phase 2 begins with a devastating Execute attack (around 10x2 damage).

The Champ is particularly dangerous due to Phase 2's debuff cleanse. Relying heavily on stacking Weak or Vulnerable to survive Phase 1 will see those advantages disappear at the 50% threshold. The best approach is to either burst through Phase 1 quickly or build a defense robust enough to handle both phases independently. His high HP makes him a lengthy fight, so sustainable damage and defense are more important than burst strategies.