Advanced (4 RP)
Prerequisites: Advanced or monstrous power level.
Modifiers: Pick either mental or physical ability scores. Members of this race gain a +2 bonus to all of those scores, a +4 bonus to one score of the other type, and a –2 penalty to one other ability score of the other type.
I have looked around but I can't find out precisely what the Prerequisite is checking for. Can someone explain?