Okay, the CON makes sense, just a little confusing the first time. :)
This is kind of how I was picturing it as well.
The setting makes a big difference as well. If you went like Pathfinder 2e where people only gain a certain amount of health back after a long rest, rather than all of it like in D&D 5e, I think it would work great and not be OP, since people will watch their health a little bit more.
Good times!
!PIZZA
!hivebits
RE: Its a Regenerating Energy Shield for D&D