Prototype Alex Mercer with Power is an addon that replaces the set of the protagonist, Alex Mercer to ROYAL KNIGHT. In the game, you will fight against different monsters and defeat them in order to save the world from chaos. You will also need to upgrade your skills in order to fight against them. In addition, you will get claw and blade replacements, which are BLOODHOUND CLAWS and ELEONORA'S POLEBLADE respectively.

The character will also be able to use different powers and weapons. In addition, the game will have a story, in which you will need to fight against different monsters. In order to save the world, you will have to defeat them.