I still don't quite understand the points used are permanently erased or is it like the resistance that after a while recovers on its own
Nope, they are compressed by 10 times. And from bronze level every 1% recovery is equal to 10 times of the previous black Iron level and it will continue to increase in future.
Naruto_uzumaki_7792:That's not what I mean, what I want to know is if the health points +[ 2388] after upgrading stay the same or are permanently erased and then you have to wait to Get them back slowly?