Rusted Rusher's Lairs. He has had multiple in the past, but has been forced to move for different reasons.
Rusted Rusher's first lair was located in a wasteland which was the remains of the company that built him. It was a big, somewhat rusty fortress. however, an attack from a sky serpent had destroyed it, forcing him to make a new lair
Rusted Rusher's second lair was located in an active volcano. Due to predictable problems from having a lair there, he moved again.
Rusted Rusher's third lair was located in the caves from the Cave Chaos series. He eventually abandoned it, though it wasn't destroyed. It's likely become infested with cave creatures.
Rusted Rusher's fourth (and current) lair is Dr. Boshi's base (after the events of Final Ninja Zero). He has reconfigured the inside of it a lot.
- The sky serpent that destroyed his first lair is not the one he used to have as a pet.
- He had said pet sky serpent during his second lair. It didn't die, but it escaped and was lost when the volcano erupted.