Perun
Mushroom
The idea of pantheon worship appeared in 2e [smallcaps]Planescape[/smallcaps] accessory On Hallowed Ground, and was also present in 3e's Deities and Demigods, where, IIRC, a character could worship an entire pantheon, provided it was what is called a "tight pantheon" (the core D&D pantheon is a "loose pantheon", in that each deity is a religion unto itself, whereas in tight panthons, the whole pantheon is the centerpoint of worship; D&Dg's Olympian, Asgardian, and Pharaonic pantheons are all tight pantheons).