Where to find the primal stone for 'A Severed Mindseal' in Phantom Blade Zero

To acquire the Primal Stone for the optional quest A Severed Mindseal in Phantom Blade Zero, embark on a quest within the Valley Sha-Chi Tower. Initiate the adventure by traversing the main path from Weeping Creek Valley, passing the 1st Floor bell of the Sha-Chi Tower. Upon entering the tower, ascend to the roof and engage the Friendly Shadow Warden.

Before commencing the task, ensure possession of the Sha-Chi Furnace Inspection Crank. To procure this, retrace your steps to the tower's summit, cross the roof, and descend a ladder towards a cloaked enemy near the ledge. Defeating this foe will yield the crank. Once equipped, teleport back to the tower's first floor. On the north side of the furnace, employ the obtained shaft mechanism with the Sha-Chi Furnace Inspection Crank.

Upon interaction, a hatch shall open, disclosing the Primal Stone within. Ascend to the tower's summit to present the Primal Stone to the Friendly Shadow Warden, thereby concluding the initial segment of the A Severed Mindseal quest. The Shadow Warden will subsequently commit to a future reunion.