KCM bond mystery (requires edo minato): Cast mystery with minato , mystery damage increased by 30% and cause interruption. This bond skill and the original kurama mystery will take turn.

Edo Minato bond mystery (requires other 3? edo hokages): Invoke barrier four red yang formation, increase ninjas' defence and resistance in the field by 100% and except the starting chakra, both sides unable to gain any additional chakra

(credits to kian for translations of the skill descriptions)

needless to say, these might be subject to changes at the discretion of oasis/devs.