i tweaked it a bit. i originally had it as 'determining the number of vestiges that you can bind...', but upon further consideration, i felt that too weak. instead of stacking for purposes of eldritch blast (a la swift hunter/ambusher/etc), i decided to augment binding further. now it stacks for purposes of binder level, affecting both number and level of vestiges bound.
definitely more powerful, but still within the realm of what i believe is fair. my original feat had a couple of combinations that i had played around with, but none of them seemed optimal, yet playable at the same time. this one i think i could be happy with. any thoughts for or against?