Quest for the Crystal Skulls is a new action-packed episode for Heretic. Corvus is confronted by a Heresiarch, a powerful minion of the Serpent Riders. This dark wizard has stolen three crystal skulls, using their power to open a portal to the underworld in the hopes of bringing about his master's return. Corvus must collect the remaining six crystal skulls in order to unlock the celestial path and confront the Heresiarch before it's too late.