Compartmentalization perk makes Lightweight Equipment Mastery free to take immediately upon the start of the game, without spending a mastery point. Compartmentalization is a unique perk in the sense that it does not automatically pick Lightweight Equipment Mastery; it just removes its Mastery Point cost. It is up to the player to pick Lightweight Equipment mastery, for free, during the game.

Compartmentalization Perk has also been covered in the official Perk Detail Overview on BlacKcuD's blog.

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