Thanks alot for all that input, it’s all very helpfull @Evgeni_Popov @Alexander_Sosnovskiy
After having a good lock at the PG, it does feels less complex. I’ll just have to give it a try and see it it works for my case 
A little about performance, my original plan was to able to have 20-25 players, and 100 enemies, and once I finish integrating VAT/instances, I’ll should be able to do at least that but probably quite a bit more. In all case, more optimization can always come later: I just do not want to get bogged down and end up over-optimizing and actually never finishing the project.
In the meantime, I did work on a critical part of the project… drum roll…: added a new rat enemy to the dungeon level 
