Can someone explain what bonus it does for me as a tank. Is it just a damage taken buff like mighty guard in the other ff games. I've used it once near the end of a fight just to see what it did, this was early on in the game so no one else seemed to want to use it. I saw something flash up but was on the vita at the time and couldn't read it. Also, does in matter if your near each other when used or is it map wide?