Appeared in the Fiend Folio.
In 2nd edition, Olhydra appeared in the Monstrous Compendium Appendix 3 for Planescape alongside not just his former brothers & sister, but also a cast of four new good archomentals: Chan, Sunnis, Zaaman Rul, and her new personal rival, Ben-Hadar.
Dragon Magazine #347 gave us the most insight into Olyhydra - and the rest of the Evil Archomentals - of any edition before it.
All of the Princes of Elemental Evil made their grand debut for the newest edition in the D&D 5th edition adventure "Princes of the Apocalypse", which revolves around the party kicking the asses of the ever-fractious Cult of Elemental Evil.
|The Archomentals of Dungeons & Dragons|
|Good Archomentals:||Chan||Ben-Hadar||Sunnis||Zaaman Rul|