Hi! Once Group Summon is recruited, Group Summon can be used in Great Ninja War, it is not required to feed Group Summon with Chakra to use them. Feeding Group Summon with Chakra is a feature to improve Group Summon's level, temporary increase attribute bonus, or temporary increase Group Summon's battle power. The reason why it is temporary is because it is intended to reflect the activity and size of the group.

I do notice quite a few players asking about server merges. If your server requires a server merge, I highly recommend using the "Server Merger Request" Thread as it will greatly help us!

Thanks so much for your time and patience, if you do have any questions please feel free to contact me or any of the moderators.

~Jib