So, yes I have acknowledged that Whispers of the Endless Paths would be perfect for my build but I think I will still gear my character how I planned for now.
I don't mind not having something 100% optimal, I try to make the best I can by still following my idea of the character.
I managed to finish the game with an assassin that what really bad, I barely never used the assassin abilities as I was not a fan of how much ressources it was eating, and so I played it with the assassin con penalty, but none of its advantages, he died a lot.
This run is kinda my revenge on this, this time, good luck for killing him ! at least I hop so...
But thanks for all the advices, it shows that this game has so many possibilities, and your reactions and enthousiastic ideas here prove it, I'm happy if it can inspire other peole, thank you.
I think I will follow your advice and drop Echoing horror for adept evasion.
Not sure if it is really better, but it follows more the idead of the build, and Echoing horror might be a bit too situationnal.
I will wait before deciding if I sacrifice something else for Psychovampiric Shield.
On top of replacing another skills, I'm worry my rogue would have too many spells to cast, and too much focus needed: Borrowed Instinct, Mirror Image, Llengrath's Displaced Image, Eyestrike, watcher ability for int brillance aspiration to get ressource back.
So I'll try without it for now, and in case I really need the resolve inspiration I'll still get the one from the peer rest watcher ability...
My main affliction will be a perception one, which will be an issue against immune ennemies.
I got the might and dexterity ones for a short duration from the trickster spells (Arkemyr's Dazzling Lights and Gaze of the Adragan), the frightened from the watcher ability peer rest and that's it, or rely on allies.
I still prefer to pick Confounding Blind over Crippling Strike.
And since I use BPM mod, I really need to inflict 2 affliction to get the deathblow sneak attack bonus (persistant distraction only lower defenses now, it does not inflicts 2 conditions anymore).
That's the weakness of the character.
I wonder something though: do you know if Llengrath's Displaced Image and adept evasion stack ?
The first make 30% of hit become grazes against reflex, and the second makes 100% of grazes become miss.
Do those 30% of hits converted to grazes then become miss as well if you have both the abilities ? Or still grazes ?
Would be a bit too good to be true imo.