Basis: Brave Frontier's Frontier Hunter
Lore:
Once a month, heroes and Valiants alike join rigid exercises to improve themselves and, ultimately gain the title "Valiant"
Ever heard of a monthly event with pleasing rewards and rewards that can be unlocked by participating in the monthly event by getting certain "points"?
Sounds good?
Mechanics:
Basically, the game mechanics is to achieve a certain goal to unlock the rewards(mainly gems and, if possible, equipment sets)
The goals could be:
Deal more than xxx,xxx damage in x turn
Survive for x turns
Don't let the enemy use active skills in x turns
These goals might be aimed to the developed squads, but I'm just giving examples.