Bullet Jumper++

Once per mission this allows you to enter an alternate form of Blue mode. In this mode you will absorb all damage taken and use it to heal. You can easily heal to full health by allowing Overlords, powerful traps and deathballs to hit you.

Tip: Anything that can knock you out of Blue mode can still knock you out of this mode too.

 

It is on level 88. It is easy to find.