Berserker Lords are highly resistant to damage. Their shoulders are the only unprotected area vulnerable to standard weapon fire. Their main defense lies in their head-mounted Phazite plating, which can only be destroyed by the projectiles it fires. Berserker Lords are a desperate measure, designed to exploit Phazon as much as possible. The few Berserker Knights that survive the highest level of corruption are promoted to Lord status. Lords are distinguished by their ornate Phazite plating and the Phazon reserves they carry on their backs.