This solo event has a Collection! You will need to finish the Collection to claim the mythic hero. The epics are all found both in the storyline maps as well as from the event runes: Liashi Ogre Chieftain, Marsh Goblin Witch, Badlands Brute, Sug-Yugol High Priest.
Horned Darkrealm Orc, abilities: Necrotic Cut, Terra's Curse Chant, Channel Mana Power 421
Moroz the Dark, abilities: Minor Heal, Poison Bolt, Resurrection Power 353
Alshin Shooter, abilities: Dual Shot (5), Toxic Barrage, Haste Power 362
Ugg the Mute, abilities: Steal Spirit, Spirit Ward, Smashing Fist Power 299
Horned Darkrealm Orc, abilities: Necrotic Cut, Terra's Curse Chant, Channel Mana Power 421
Moroz the Dark, abilities: Minor Heal, Poison Bolt, Resurrection Power 353
Alshin Shooter, abilities: Dual Shot (5), Toxic Barrage, Haste Power 362
Ugg the Mute, abilities: Steal Spirit, Spirit Ward, Smashing Fist Power 299