Wiktionary
heal up
vb. 1 (context intransitive of an injury English) To heal. 2 (context intransitive video games English) To heal one's character.
Usage examples of "heal up".
That was the first thing Alvin had to mend, heal up the blood vessels and get the blood back where it belonged, flowing in its channels.
Have you ever noticed how we constantly expect people to heal up from the beatings of life and lose their scars?
The fact you heal up even from the dead and form blood mice says that you can create a Get.
He had so many endowments of stamina that when a sword passed through his heart, it would heal up again as the blade exited.