User blog comment:Darth Phazon/A original Marty Sue/@comment-860254-20141113121647/@comment-5623885-20141113161342

Being mostly Dinosaur (which is basically a combination of reptile and bird), he has extreme vunerability to cold, sonic weapons, and a few others.

Plus, if he suffers damage to any vital organs, he would die, just like anyone else would; he can regenerate limbs, but not organs.