The adventure uses the d20 magic system. We did discuss creating a different magic system but most of the SORCERY! spells are already in the PHB: ZAP - Lightning bolt, NAP - Sleep etc.
The spells like GOB and YOB have been replaced with new magical items. Originally they were spells cast on a tooth to create either a goblin or a Hill Giant. These are now called Teeth of the Goblin Army and Teeth of the Hill Giant Army.