@Fellgnome
That's kind of the point - to add synergy for the Warrior / Rogue / Ranger classes. Currently the only build which actually synergizes with itself is pure mage, and it synergizes SO HARD. Being able to use more than half the skills in the game, AND combo off of your own abilities, able to do it all at range, and you only need to rely on a single stat? What the hell.
The other point is to make it harder to combo with yourself. Poison would rely on Str, but fire would rely on Int. Water would rely on Int, but Lightning would rely on Dex. Gotta multi-class or rely on your team mates to pull off them sick combos.