fire emblem but there is an endless horde mode that is wave based and at the end of every 3 waves you spin a wheel that either gives you some type of buffs (stat boosters, killer weapons, +1 range skills, max a support, spawn a bunch of dragon veins, etc) or permanently makes the enemies/map harder.
To incentivize the player to move around the map there will be thieves with weapons or promo items that spawn around the map and only stick around for a few turns. Maybe throw in recruitable enemies but FE doesnt really do that much anymore.
to make the endless mode more varied there will be 3 different game modes, VIP, defend throne/border, kill boss w/turn limit.