Celestial Nonary Pill Celestial Medicines

Several can be found throughout the game.

Near the Outside the Cave shrine in the Black Wind Cave area. Run up the hill to the left, climb the wooden scaffolding, and you’ll find the item on a table at the top.
Near the Valley of Despair shrine in the Sandgate Village area. Enter the cave to your right, climb a rocky ramp, squeeze through a crack in a wall, and destroy a wooden barrier to find it on a table.
Near the Temple Entrance shrine in the New Thunderclap Temple area. Go through the temple next to the shrine, climb the left stairs behind it, and stay left to find another temple. Exit through its upstairs balcony, then look out for a frozen lake on this raised area - you’ll find the item on a table at its edge.
Near the Court of Illumination shrine in the Temple of Yellow Flowers - only accessible after beating the Supreme Inspector during the talisman quest BEFORE beating the Hundred-Eyed Daoist Master.
Near the Purge Pit shrine in the secret Bishui Cave area. Start by descending the stairs next to the shrine, gradually moving right onto the lower sections. Next, climb the stairs at the edge of the large clearing, then hug the left wall - you’ll find the item on a table behind a stone tablet.

A miraculous pill refined by Lord Lao from the Tushita Palace that massively increases Maximum Stamina.

A miraculous pill refined by Lord Lao from the Tushita Palace that massively increases Maximum Stamina.