I've uploaded a new version which includes a decay time for Furious Slash. I also added some effects, but since you didn't specify anything about the effects, they aren't great. Feel free to edit the configurables section of the spells to change the effects.
Also, I used the Blademaster model for testing, because the Captain one doesn't play animations. I added the "spin" animation for Rotating Bash which looks quite cool. But you will have to change it if your model doesn't have that animation.