This Portal Event gives two powerful caster heroes a chance to appear in the heroic portal.
Heroic Summon[]
Demon and Necromancer Battle it Out with Powerful Spells in the Heroic Portal!
Icepick and 
Pontifex Mortis have an increased appearance rate, even though Pontifex is not normally in the heroic portal.
There is also an event to go with this Portal Event, Casters Conclave.