Enemies stay dead, but not kill all the clones

Help Requests
1

So issue I have is I made it where when monsters die and you go to another level and come back and they stay dead, but issue is that it kills all of the same monsters.
I need a way that it saves the ones that died, but not kill all of the clones that I haven’t even fought yet.
Link: https://flowlab.io/game/play/1476516
Please use pictures thank you

2

Theres not yet a way to do that sorry

3

Well theres a way once you kill a boss it stays dead in only one levle but it effects all of that boss in the levle

4

oof thanks for info