Letting people play with their friends, regardless of level. It really is the antithesis of an ARPG if you look under the hood. The game literally bases damage on a percentage base while giving the players damage numbers that are meaningless. Higher levels mean the percentage of the player’s true damage go down instead of up but the shown damage keeps the illusion of progress. This keeps the player in the Skinner box while making the game easier to program and to balance.