Wheee!
Craer, that's officially creeping me out. I keep looking at the blank holes for eyes and the little tail. . .
The star formation that triggered the comet cycle was never specified, so it can be anything you want. The shooting star (comet) that was pulled from the sky by the Imbindarlans came from a constellation known as the Gander, and specifically served as the goose's eye. The Imbindarlans triggered the spell that yanked it from the heavens and created the conjunction by starting a war, sending thousands of captive commoners onto the battlefield disguised like real soldiers, and using their life energy as they got slaughtered to trigger the spell. Then that night, they used the remaining energy to cast a massive animate dead so they could have a real army. . .
Tovag Baragu (stolen directly from Greyhawk, thank you very much) is on top of a desert mountain way out in Kanach'Hur, the desert of the screaming sands. The stone circle is made up of three concentric circles of massive stone plinths. Odd lights and visions play between the stone uprights. The exact center of the stone circles is a shallow vertical cave, and that's where the actual seal is. This is where Velendo fought his nemesis and lost much of his strength before using his shield's talisman of pure good to send the man hurtling eternally to the center of Spira.