The Acolyte’s mysterious Sith is wielding more than just a creepy helmet and badass Force powers.

He also has cortosis!

This article contains spoilers forThe Acolyteepisode 5.

Osha (Amandla Stenberg) and The Master in a scene from Lucasfilm’s THE ACOLYTE, season one

Episode 5 ofStar Wars: The Acolytefinally saw Maes master in action in all his unsettling glory.

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But despite all of its strengths, cortosis is difficult to mine and use regularly.

Its a fragile substance, and is only useful once refined.

Even without this metal, Qimir is a formidable opponent for the Jedi.

The Acolyte is streaming now on Disney+.