Skill (stat)
From Fire Emblem Wiki
Skill increases one's Hit percentage, Critical rate, and chance to activate special skills such as Lethality and Aether in certain games.
To calculate the chance of a critical, the formula is as follows:
Unit's Skill / 2 + weapon critical chance + support bonus + the class critical bonus or skills - the enemy's luck + 5% (if a character has a S-rank in Fire Emblem: The Sacred Stones only)
The only Fire Emblem game in which characters could not reach 100% critical is Fire Emblem: The Sacred Stones.
