Ygorl was the slaad Lord of Entropy. He was the second-oldest slaad lord, after Ssendam, and was considered the de facto ruler of the Outer Plane of Limbo. He was said to have created the Spawning Stone that was the focus of the slaad race, forcing them to take frog-like forms rather than their original, purely chaotic shapes.
He rode a great brass wyrm named Shkiv. As one of the exemplars of the chaotic neutral alignment, Ygorl was not truly evil, but still very dangerous, unpredictable, and self-serving. He believed in bringing death, decay, and disorganization to the multiverse, and thought this was best done by the slaadi, the truest agents of Chaos.
He carried a 8' sickle with the slaad word for "death" inscribed on it and he could murder opponents instantly with it.
Ygorl considered the slaadi to be his living pawns. They did not serve him in any organized fashion, but most would obey his orders rather than allow him to devour them. Besides Shkiv, Ygorl was allied with Sorel, his lieutenant, who he was grooming to become the Lord of Anarchy.
Ygorl's fortress in Limbo constantly changed appearance; it could be a rough cavern, a shattered marbled temple, or a series of interlaced carved spheres that whirled through Limbo's layers.
- Ygorl was created by Charles Stross for the Fiend Folio 1st edition.
- Ygorl had small parts in the anthologies Tales of the Outer Planes (1988) and Tales From the Infinite Staircase (1998).
- Ygorl appears as the main villain in the game Demon Stone, where he battles the party for the Silver Sword of Gith and the fate of Faerûn. One can visit his realm and battle him for the final battle. However, his depiction in the game does not match descriptions of him in the sourcebooks.