improved guild chat, let guild leader post things that will always be there. That way they can post rules, and every member will see it.

Guild raids, or guild bosses, that guild can fight together.

guild bonuses, like a temporary bonus that makes it more likely to find fusion stones. these would be bought with guild funds similar to guardians. 100,000 for 1% increase, 250,000 for 2% increase, up to like 5%. another one for keys.

FIX START BATTLE, its so annoying when people can just keep pressing it over and over, and waste all of our guardians.

add an extra area each week for people who have beat dark prince. this would appear like epic boss, and then disappear after time limit.

let guild members donate money for specific things. "You have donated 500,000 towards element bonuses" or guardians, or w/e you want.

I like the idea of fusing two same armors for plus version.

add something to make farming more fun.

more limited edition quests, those are really fun.

use certain amount of gems to fuse certain level of armors, like 50 to get epic. should not be automatic, but should drastically increase chances.