Needs review
Source: Quintessential Elf 2

Description: You know Charms that help to steady a warrior’s hands.

Prerequisites: INT 13

Required for: Archer's Gift, Swordsman's Gift

As a standard action you may sacrifice an arcane spell of any level. For a number of rounds afterwards equal to the level of the spell sacrificed, you may use your Intelligence modifier rather than your Strength modifier for determining your bonus to attack rolls with melee attacks.