In the last campaign I played in, my group and I invented our own version of the Whirling Frenzy for my character (long before UA came out). It was a bit different, though- and, in retrospect, I'm beginning to think that the Whirling Frenzy would have suited him better. Basically, my character was supposed to be a kind of Barbarian/Samurai- sort of- so his Strength and Dexterity were really high, he had Weapon Finesse, and used a Katana. His rage, however, worked exactly the same as a Barbarian Rage, the only difference being that he gained a +4 to Strength and Dexterity, and a -2 to Constitution (so he had a few less Hit Points, but his AC and Strength would go up). The duration went off of his Wisdom, rather than Constitution, to represent his focus or something. He didn't gain the extra attack, like Whirling Frenzy does, and he gained the normal Indomitable Will instead of Evasion, which the WF grants. The extra attack would have come in handy, though, when he was tearing through undead in the Underdark. Oh well. He was an awesome character to play. With his Dex bonus and all from Rage, and 20th level, his AC, at best, was somewhere in the 50's. Nasty.
