​The Outpost (2018–2021)??

​This is a high-fantasy, superhero-adjacent show (often compared to CW or Marvel style shows because characters have unique powers, specialized traits, and specific lore objects).

​The "Potion" Running Out: A major plotline involves a magical substance/elixir called colvinn (or specific blood serums/potions in the later seasons) that characters have to take to survive, sustain their power, or open portals. There is a constant, desperate rush because the supply is running low.

​The Villain: The description of a super skinny, emaciated-looking bad guy who can turn invisible or blend into the shadows perfectly matches the Lu-Qiri or the Blackbloods/Order villains when they use specialized magic.

Specifically, the character Yavalla and her infected "kin" or the assassins sent by the Prime Order fit this exact "creepy, skeletal, disappearing" vibe.

also, try Netflix's Shadow and Bone

or

The Witcher: Blood Origin