I've just checked the price of minor legacy: battle frenzy reduced cool down at the store and it's at 795 tp which is a very high price i believe. And it also says on the tool tip that it can be used only once. On the other hand i don't know if it's possible to keep this legacy on all my weapons up to the level cap. I mean, is it possible to transfer it all the way up till my last LI? because if i can do that then the 795 tp might not be so much expensive after all.
I am lvl 59 at the moment.