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The Legio Osedax's Forge World of Phaeton long had a dispute with Mars during the Great Crusade. During the Horus Heresy, their forge world Phaeton was an early target for the Dark Mechanicum, and much of the Legio’s Titans were destroyed in the assault. The survivors used their losses to fuel their desire for vengeance. Legio Osedax Warlord Titans were often bequeathed the names of mythical beasts drawn from the annals of Ancient Terran history.
- Terra's Calling — Imperator Titan. Fought in the Battle of Beta-Garmon.
- Galeru - Warlord Titan.
- Enmity's Angel - Reaver Titan. Fought in the Defence of Ryza.
- Striking Fang - Warhound Titan. Fought in the Defence of Ryza.
- 1: Imperial Armour Volume Twelve, pg.18
- 2: Imperial Armour Volume One - Second Edition: Imperial Guard, pg. 10
- 3: Adeptus Titanicus (2018) Rulebook pg.17
- 4: Titandeath (Novel) — Chapter 23
- 5: Warhammer Community: The Titan Legions of Ryza (posted 7/20/2020) (last accessed 7/20/2020)
- 6: Adeptus Titanicus: The Defence of Ryza, pgs. 32-35