Okay, So I had an amazing idea. Well first of all Book said personally if tailed beast get added they will be boss battles. So i was thinking,What if the boss battles were you raid a tailed beast then you get its power after you kill it eh? Simple enough However to make it more legit, Once you kill a tailed beast A seal forms on you stomach and when you die you lose it just like Naruto would if he died the nine tails would die with him.So to balance it out if you die more then three times after it's sealed,The seal will break and the tailed beast will go back to it's original area of origin after a few days irl [up to 72 hours in game time]. Let me know if this is a good idea or not?