If fate is the raging fire that burns the Uchiha, I would weave a rain of lies that never lets anyone wake.
On the brink of death during the Valley of the End battle, Itachi awakens the Mindscape Corridor:
Accelerated Thought: He can deduce a thousand possible futures in one second, but cannot fathom the hatred in Sasuke's eyes.
Weaving Memories into Fate: He erases the truth behind the clan's massacre, but tears their brothers' warm childhood memories to shreds.
Consciousness of the Abyss: He crushes the souls of Kage-level fighters, at the cost of tearing away his own light with his bare hands.
After altering Sasuke's memories to create a false peace, he falls into an even deeper trap:
The erased last words of Shisui expose Danzo's plot to implant Kotoamatsukami.
Lost in a dream, Sasuke becomes the perfect vessel for Orochimaru's Memory Purification.
Amid a bloodline disease and mental backlash, Itachi, on the verge of collapse, glimpses the Ōtsutsuki's game.
“Brother, why does the beautiful dream you gave me... hurt more than Tsukuyomi?”
When Sasuke's Kusanagi sword pierces the corridor's illusion, Itachi finally understands:
The price of changing fate is becoming fate itself.