Talk:Quests/@comment-80.99.81.226-20180809010135/@comment-26447088-20180809185237

The auto-battle function is quite self-explanatory. Instead of manually tapping your units yourself, the game will select your units from right to left to attack, skipping the animations if any proc. It does not use burst nor abilities, and does not increase skill % (it's probably just by chance that it seems to activate more). This continues until you tap on the screen, after which it'll stop automatically attacking.

It's worth using if your deck is strong enough to clear the quests without needing to target specific enemies or anything, since it will go from right to left no matter what the enemy wave is like.