From the introduction (corrected for grammar):
The old man with a long gray beard, wearing a worn tunic and a pointed hat, walks slowly aid by his staff. While everyone runs away, astonished with the demon invasion coming through a portal in the middle of the town, the old man walks the opposite way, going toward the abyssal army. When the wizard finally sees the planar portal, he starts to make complex gestures and lifts his staff, issuing words of power...
Presents several class-specific options and proposed enhancements.