Maps:
Blue waitroom- Yuno Airship Port
Red waitroom- I don't know, lol.
Battlezone - Izlude city map.
You join a side, NPC gives you a limit amount of coins, you buy consumables (only usable on DA)/fix broken stuff/heal with them.
Pretty similar to WoE, but Crystal could be protected with heal and stuff. Random Crystals would appear in the sides of the map to buff the person who breaks them (DEF or ATK).
I suggest to mix DA with BG, Because BG have some interesting ideas.