-Let a friend become a reinforcement for a battle. Instead of 4 units, you field 5: your team + your chosen friend's leader. Both get something like 10 feathers or even crystals if you win. A friend can only be used once per day to prevent Hector abuse. They can even restrict this feature in Grand Hero Battles and Voting Gauntlets to keep the challenge.
-Map preview before committing stamina to battle. Even just the map and not preview the stats and skills of the enemies.
-Ability to sell badges for feathers.
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Fate Grand Order
Dragonball Legends
IV Calc
Heroes