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El-Stier is Rico's Omnigear. El-Stier was created when the Anima Relic Gad aligned with Stier in the Anima Dungeon Two near the end of Xenogears. El-Stier is a larger and more powerful streamlined version of Stier, but it's not that remarkable and is still just as slow as the normal Stier is. At the near end of the game, it can be fitted with its own unique HP Frame found only at Big Joe's shop in the optional Lighthouse dungeon, along with Seibzehn.
- In Xenosaga Episode III, four Gnosis appear on Abel's Ark, guarding the way to Dmitri Yuriev's location and Ω Res Novae, similar to the four pillars of Deus' core in Xenogears. These each resemble several of the Omnigears from Xenogears. One is named Natus Tellus and resembles El-Stier.