Battle Phase! Characters run to the right to meet the enemy and auto-battle each other. You should either be able to modify their formation before battle OR maybe their aggression meter determines whether they hang back or charge forward?
( Idea from Chrono Trigger )
Power bar auto fills to max and then triggers the character to auto use their "Special Move". Could be mass heals, more damage, defense buffs. Maybe for a Necromancer a max power bar lets them summon a minion. Maybe there's ways to modify the power bars speed of regeneration.
Your artifact enhancement is displayed to the right. Players would mouse-over the artifact to see the enhancement. The characters have canned speech bubble responses when they do certain things in battle.
Oh and the "Wreckers" title is an idea I got from the game, Darkest Dungeon. If you mix a certain group of characters together, the game would give your party different titles which I thought was cool. Not sure if it gave the party an advantage or if was just an indication that it was a good build.