After doing something frankly ugly (it's annoying because there does not seem to be an alternative path) to advance on the main quest, i managed to obtain the door code for the Lab x-18 from those Sin horrible people.
Once i went to location, for the first time in that game (as it has been incredibly well performing up to now) i faced a massive sutter/lag that went on for a dozen of seconds.
(edit : it's actually documented in the readme that i overlook, the only place in the game in which there's such problem, you just have to wait the lag to disappear, it's loading all the monsters and all the insane amount of items physics when you enter first the lab, those insane amount of physic-ed objects are because there are a few damned burers that will psychically throw them at you constantly in every rooms)
After performance was back to normal, i understood what happened rather quickly : a huge amount of rats and giants rats had spawned down there, along many of those bizarro child-sized running zombies, i guess some of those spawned in wrong area and their broken path finding hurt the scripts performance very badly.
Anyways it was good i had grenades because i wonder if i had enough normal ammo for this ridiculous amount of enemies.
After noticing a bloodsucker that was stuck running into a wall (great so i killed that thing without risks for once) , i decided to climb into a vent system.
Annoying vent system because Lab x-18 in that game had a script to destroy my flashlight when you enter for some reason (maybe the dev liked his shadow so much to build the atmosphere), as the vent was mostly devoid of any light source (and fortunately no enemies in there).
When i found an exit to that vent system, i started to see some eyes burning into a completely dark room nearby.
Then as whatever thing started running i saw the shape, a damned burer , he was throwing wave of his powers and various objects while i was hiding behind a wall and shooting from time to time from that cover.
Some lights were surrounding his hands at some point and he gestured, i assumed it was the force field he creates temporarly for a few seconds when shot like those burers do in other Stalker games and mods.
Except it was not because as soon as i came out of cover to aim more carefully at the damn thing head while the force field was up (as the burer usually can't do anything when he maintain his force field), i got a full power wave right to my face and sending my character out of the game.
Yeah, so in this game they can force field and shoot at the same time.
So far that game has been a lot of fun.
Oblivion Lost Remake : Vector of Alienation