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Rust Tyranno is a boss in Chrono Trigger. Appearing in Giant's Claw during the Middle Ages, he guards the Rainbow Shell in the bowels of the cave and is believed to be the fossilized incarnation of Black Tyranno. Due to its extreme mass, Ayla's Boulder Toss and Tail Spin are ineffective against it.
|Chrono Trigger Bosses|
|Prehistory||Nizbel | Nizbel II | Azala | Black Tyranno|
|Antiquity||Golem | Mud Imp | Red Mudbeast | Blue Mudbeast | Giga Gaia | Dalton | Lavos | Golem Overlord | King Dalton|
|Middle Ages||Yakra | Ozzie | Zombor | Masa & Mune | Flea? | Flea | Slash (Unarmed, Sword) | Magus | Melphyx (Core, Upper Body, Lower Body) | Diva Flea | Super Slash | Ozzie the Great | Rust Tyranno|
|Present||Dragon Tank | Heckran | Yakra XIII|
|Future||Guardian (Pod) | Krawlie | R-Series | Lavos Spawn | Mother Brain | Son of the Sun|
|Black Omen||Mega Mutant (Upper Body, Lower Body) | Giga Mutant (Upper Body, Lower Body) | Tera Mutant (Upper Body, Lower Body) | Elder Lavos Spawn | Queen Zeal | Mammon Machine|
|Bosses in the DS||Goldhammer | Nu Guardian | Nu Master | Archaeofang (Elder) | Archaeofang (Younger) | Master-at-Arms | Bladesman | Once-King Dalton | Steel Shade | Alabaster Shade | Crimson Shade | Eggsterminator | Dream Devourer|