Personally I think the low mana and skulls was a great challenge. I really had to perfect my skill tree for the final levels. Very GLITCHY infinity mode though... gets to 5 min and freezes or creates invulnerable enemies
Doomed Hero’s Walkthrough (plus so everyone can see)
Barbarian – intimidate, reckless fury, whirlwind, brutality, max damage and 35 quickness (through the right combination of gear).
Cleric – revive, anoint, purify, wrath, high endurance and max quickness (46+). If there’s not enough speedy heavy armour, restart.
Warrior – inspire, resolve, leadership, high endurance and min quickness (10-).
Ranger – healing lore, nature’s balm, pin, vitality, max damage and 44 quickness.
Max health gen, power gen and health drain. Nature’s balm is good for this. Leave one enemy alive to heal through passing turns. Make sure intimidate, reckless fury, nature’s balm and inspire are all active on your barbarian before landing the final blow. ALWAYS land the final blow with your slow warrior, that way your speedy cleric will lead every wave. Anoint barbarian, hit as many as possible with whirlwind. Stun whatever is left with ranger.
 "Epic Stand"){kind=icon}
 "Monsters' Den: Book of Dread"){kind=icon}
 "Legend of the Void"){kind=icon}
 "Rebuild 2"){kind=icon}
 "One Step Back"){kind=icon}
 "Grey"){kind=icon}
 "Flagstaff: Chapter One"){kind=icon}
 "Coma"){kind=icon}