Are YOU having trouble fighting Failed Champion, the Dream version of False Knight? Simple! All that you need is a couple fancy stuff!

REQUIREMENTS:
Grimmchild, (preferably phase three, nightmare king grimm is really hard to defeat)
Glowing Womb,
Weaversong,
Dreamshield, (airborne particles might getcha)
Crystal Heart,
Monarch Wings,
And a lot of patience!

Step 1) Use Crystal Heart to Super Dash to the left, you’ll immediately find the arena
Step 2) Use Monarch Wings to get to the very top of the arena’s ceiling
Step 3) Use Crystal Heart to cling to the top of the wall (make sure you don’t release Crystal Heart)
Step 4) Wait, for a very long time. Your “minions” might take forever to defeat Failed Champion, but slow and steady wins the fight or something. If you want to know how much longer you have to wait until Failed Champion is defeated, he gets staggered three or four times. Staggering, in this case, means he falls over and his helmet comes off.

Failed Champion will not be able to hit you with his mace nor via contact damage since you should be too high up. If he leaps high enough then he might get damaged by Dreamshield.

Also, if you get hit, react quickly, Failed Champion deals TWO Masks of damage.