First episode intro to feature Jake morphing into his current self in the season.
When Charlie is trying to relate what happened to him at the coven party, he says, "because together we shall spawn a child named Giglamesh and he shall bring forth a new age of Darkness." He's probably mispronouncing Gilgamesh, who was a God-King of ancient Sumeria, who survived the great flood and is believed to be the basis of the Noah story.
Episode title spoken by Jake, during the seance.