Board Thread:Questions and Answers/@comment-212.118.232.4-20131212025452/@comment-9686463-20131212034615

I keep the ones from events, since you are not likely to find them ever again outside of the Shrine of Seven Days. With special summons, it depends on the skill. Ones that would be good for tower events (i.e., cheap attack boosters, cheap defense reducers) I try to keep for sure to minimize the amount of AS used per battle.

If you do fuse them, level them to 5 or so and then feed them away to get a much bigger exp boost than just a lvl 1 3*. :D