Go To Hell

The player's Adepts have uncovered a Hellgate, and a particularly powerful one at that.  Risking much to deal the enemy some serious damage, they open the hellish portal and jump through into hell itself, where they will battle creatures ala Dante's Inferno.
This type of mission should only be possible for truly experienced and powerful Adepts!  If the Adepts survive and return they will find themselves exceedingly strengthened in their powers and the local forces of the Darkness will find themselves stripped of much of their supernatural magicks.