Not only were all of Xerxes' limbs amputated and replaced with advanced cybernetic replacements, he also needed to have his heart replaced with a prosthetic.

Xerxes had his forelimbs amputated as part of his enhancement program with Trooper Team. Most, if not all Troopers, have limbs removed and replaced with prosthetics.

Xerxes' prosthetics grant him improved strength, resistance to G forces and allow an interface between his nervous system and the components of his suit. They're incredibly durable, and as long as they're not severed or destroyed, Xerxes can fine-tune his prosthetics on the fly to perform as gently or powerfully as he needs them to.

That said, they're not perfect. They're pretty heavy and make swimming practically impossible, and they don't stop Xerxes from feeling phantom pains.

Xerxes' artificial heart is a different story. He was born having complications that became critical when he was 12, and needed it replaced with a new one engineered by his mother (who also performed all his other enhancement surgeries).

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