Heroic
Enemy Heroes:
+4% Damage, Maximum Health, Maximum Mana, Health Regeneration, and Mana Regeneration per round.
+1% Experience Gain per round.
Damage, Health, and Regen stats scale multiplicatively.
Mythic
All enemies:
+4% (+1% per round) Damage, Maximum Health, Maximum Mana, Health Regeneration, and Mana Regeneration, multiplied by the number of rounds.
+2% Experience Gain per round.
After Round 14, curses will no longer swap to boons.
Obtain a powerful Mythic Curse at the start of the game and every 4 games afterwards: