In another game I play, Final Fantasy Record Keeper, they have events that release new characters, or allow you to level them beyond caps, but they also have resource focused events. These events allow players to pick up increased amounts of the base resources used to level your characters, equipment and abilities.
I would LOVE to see that implemented here. I get more characters and plenty of ways to get covers for them, but ISO is an increasing problem. I would love to see an occasional event giving increased ISO/HP/CP rewards that doesn’t give out covers. I would think this would help players at all play levels. I know as a beginner the HP cost for slots was such a sink. I hate how I have to consider a second facebook account for people who aren’t really friends, just to get the ISO to keep up.
Alternatively, you could offer more increased double ISO reward weeks.