You don't need Multi-Weapon Fighting, just Multi-Attack. Multi-Weapon Fighting would be if you wanted to wield say 4 sets of nunchaku (which.. thinking about it would look rather awesome) - you don't need it if you're just using natural weapons.So If I have multi-attack, multi-weapon fighting, 13 monk levels....thats....4 attacks for base attack bonus, 3 extra claw attacks, and a bite attack? Hmm....

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.