It's a mechanic from GranBlue Fantasy that is assumed to be replicated in this game. I'm not sure if any testing has been done to confirm this, but KamiPro borrows many of its mechanics from that game. That I just watched most of my debuffs miss, and this doesn't seem to be happening to others, would tend to support the existence of such a mechanic.
The goal of such a mechanic is to penalize players that use the same team for all content (in particular, by making it especially hard to farm content for your primary element). It's just another way to get players to continue building more teams and spending money.





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