Talk:Hidden Demon Extermination in the Capital/@comment-32770570-20180205023008/@comment-2A02:C7F:7E51:2100:89D2:9A34:849:6891-20180205024338

Defeat 150 oni-ootachi, click tast completed when it lights up, then the background will be added to your collection.

It takes no more than 20 runs on easy mode to get it, you don't even need to go to the boss node if you don't want to. No special troops needed for background, no need to worry about beans either if you're just after the background not the special lines.