I don't think many or anyone is using the exodus rule set but it is basically d20 modern. I'm confused by a paragraph in it. If the character buys a class skill, he gets 1 rank in the skill for each skill point spent. If the character buys a cross-class skill, he gets ½ rank per skill point. The maximum rank in a class skill is equal to character level +3; however, there is an exception to the TAG skills the character chooses, in which case, they are equal to character level +5. The maximum rank in a cross-class skill is one-half of this number. The problem is I don't see what are class skills since the only two classes you pick (unless you are using advanced or custom) are aggressive and defensive. Anyone? I'm also emailing the creators to see. :)