in Chozodia. There, she undergoes a "Ruins Test" that restores her fighting spirit and grants her a more powerful suit capable of using ancient "Unknown Items". The Final Escape
Samus gasped, the sudden rush of Zebes’s toxic atmosphere filling her lungs. She was exposed. She looked down at herself. She wasn't the Varia-clad warrior anymore. She was clad in nothing but a simple blue Zero Suit, vulnerable flesh and adrenaline against a mechanical god. metroid zero mission high quality
The impact was instantaneous.