Karsus's avatar

Karsus' avatar is a spell whose origin is unknown. The original notes regarding its essence of were nowhere to be found. It is believed Mystra, the reincarnated form of Mystryl, snatched the spell information from the ruins of Karsus' enclave and sent it on an eternal journey to the ends of the universe. This spell allowed the caster to become a god of their choosing, replacing a current god with themself the moment the spell was completed.

[Note that the spell was not supposed to make the caster permanently into a deity. The spell merely allowed the caster to temporarily merge with the deity and wield their powers as long as the spell lasts. ]

Whether the gods were able to defend against the spell, were aware of its casting, and other factors are unknown. Karsus spent well over a decade researching this spell. It was so complex that he had to use a stone-filled gizzard of a gold dragon and part of the epidermis of the pituitary gland of the tarrasque just to enchant one of the material components of the spell.