It's the classic berserking sword; a thumbs up for the back-story.
But really, the idea of a sword fuelling your wrath is so old. If it offered you the choice, again and again, and by making the wrong choice so many times, you'd succumb to wrath... that would be cool.
As EM mentioned, the blade is a nice berserker blade with a backstory. Now, if the sword really fed on rage, its best direction would be to 1. Get its bearer into power, or be acquired by one with power. 2. Induce its bearer to acts which enrage those about him. So long as the bearer has sufficent power, those about him who are enraged may be kept in check, feeding the blade. However, eventually something snaps, the current bearer is overthrown and the blade passes on to a new bearer.
Nice to see one of the sinblades come up! I wonder how someone with an iron discipline would react with this blade. It seems that the wielder would always be walking the line between self-control and all-consuming rage.
I like that you've included a section on the relationship between blades, and look forward to seeing how the oother blades interact with one-another.
The backstory is excellent, and really ties the swords into the setting. However, I'd like to see a bit more about the blades themselves. Some ambiguity is nice for letting a GM weave it into the world, but too much ambiguity makes it harder to integrate them in, because more work has to be done to flesh them out. Also, considering this is a plot, some hooks would also be nice.
This definitely has potential, and I'd like to see it rise to that potential.
I really like the back story, the legend of the blades, however, I agree with Chaosmark, knowing more about the blades, their power, appearance and their temptations would be really interesting, and if the quality of the writeup on the blades is the same as the backstory, you'll be in HoH territory.
Consider approaching a Strolenite whose work you like and propose a collaboration, if you're drying up on ideas/motivation for the blades.
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An idea for a plot or subplot is to have a religious order train or seek people that have the qualities of the 7 virtues to be the bearers of these blades. Such as a person with extreme amounts of personal temperance wields the gluttony blade... or someone that has practiced chastity for decades is given the lust blade.
The character conflict could be amazing