Here some tips to maximize your Metal Parade run and cap your unit's level in the soonest possible time.
• You can only deal one (1) damage during the run, so choose units that have multiple hits such as Serin, Douglas, Stya and the like.
• Maximize your leader skills, use skills that can modify your damage during spark or those that can ignore def such as the Duel GX unit. You can play around different leader skills to find what suit you best.
• If you find yourself lacking energy and you only have a few minutes left in your Metal Parade run, don't worry. The Metal Parade has been updated to 0 energy cost and you can do as many runs in the vortex dungeon until the time runs out.