I've been replaying from scratch Seven Enhanced Edition as it's been a couple of years since the last time i played and forgot most of it
This time instead of exploring the huge world and doing side quests, i decided to follow the main story only as i didn't moved through those quests last time.
And so far it has been good, playing fully stealthly as much as i could, escaping when detected and coming back once alerts were off, using the (very usable) environment to "parkour" everywhere in every directions horizontally and vertically.
Was happy to see that stealth and sneaking around was always a possibility (great because i have difficulty to "get" the combat gameplay with this game)
After +/- 8 hours of doing main story quests and progressing in the world, i'm at the part in which you infiltrate a massive building called the Repositorium in which the technomagis that decided to betray the emperor have imprisonned Savaash, an emperor agent like you (you mostly against your will), and bound him into a machine to decrypt his memories in order to locate a vault.
Then you get into that machine yourself to explore Savaash memories.
After some dreamwalking around his memories, you're then thrown into an unescapable arena to fight the spirit of Savaash that is apparently not happy from your intrusion (hey buddy i'm supposed to be on your side you know) in melee, as terrible as i am with melee fight in Seven it seemed do-able from the fight first few exchanges.
Until Savaash spirit just clone himself and you face 2 of them at the same time, then another one comes after a few more hits and something invisible comes to join the fray after some more hits.
So basically you're stuck in a fight with several enemies that hit like a truck without any possibility to go stealth anywhere or escape to come back later.
Maybe it would have been do-able if the game had not made me think stealth was always a possible way instead of fighting, and so i didn't left truckload of health healing item (because weight is an issue a lot in the game) into a stash and only carried a few.
Lesson to learn : always keep a save from before going into the Repositorium so you can go away and explore the world in the hope to find better equipment, and always carry all the healing items you can before getting into this.
Fortunately i had one old save, but the less i can say is that difficulty spike was totally unexpected after so many hours of stealth gameplay.