This is very interesting, however it sounds an awfully a lot like Aion's Divine Points system

"In some RPG games players accumulate "Rage", when the Rage meter is full, the player is able to unleash a very powerful attack. However, in MMOs this system is rarely used.  In Forsaken World we're using that system and making it better.

  On your avatar info (located top right hand side) you'll see HP, Mana and the green XP meter. Players can suck the "souls" of monsters to enhance Rage, once the Rage meter is full Players can use XP skills. This skill is able to kill mobs within range, below the players level.Players upgrade, XP will follow to fill slots.
  Our developers designed different skills for each of the races as you can see in the screenshots above. The effects of these skills are very different for each race, and they have beautiful animations. some are spike on its own as the center of the circle within a circle of monsters.
  Players can increase the capacity of the  XP meter as they level up. Beginning players can get XP by collecting XP stones ( Soul stones? Not sure about this one). As the player levels up they will get a XP quest to upgrade their XP meter capacity. 

  However, XP skills are only effective on monsters, in a PVP confrontation between players it is useless. XP skills will bring a whole new combat experience!"