Love the concept video haha, gets the idea across so much better then just text. I would think creating instanced summoning though would be a bit of a challenge, especially for things like PvP and the new claiming system where everyone fights the same mob. I'm not too sure though if this would really be "fun"... stand there and wait til your gauge fills up before you can do anything.

It was never fun using Cyan in FF6 and just waiting to get his 9 skill >_> Won't be fun standing around waiting for this either (unless ofc it happened super quick)