Second reason is to play against other guild members in a tournament format. (deconstructoroffun.com)
-- Normal stage, where you can go rescue Sally — Special stage, where you can acquire evolution materials — One - on - one battle PVP, offered per season — Arena, with many different options — Endless mode, with a never - ending stream of enemies — Guild raid, to be enjoyed with other guild members (andyemulator.com)
This also means guilds no longer need to request aid from other guild members in order to construct Fort or Command Post. (dulfy.net)