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There is a Legacy version here.

PFS StandardSin Reservoir Feat 8

Archetype 
Source Rival Academies pg. 117
Archetype Runelord
Prerequisites Runelord Dedication
Requirements You are holding a weapon in the polearm or spear group.

During your daily preparations, you can indulge in your associated sin or meditate on its values (and risks). When you do, you gain one additional spell slot of any spell level up to two levels below the highest-level wizard spell you can cast. You can prepare only one of your curriculum spells in this slot.

Traits

Archetype:

This feat belongs to an archetype.