Squad Ace I (Japanese: 第9迷宮の覇者Champion of the Ninth Labyrinth) is a Sacred Seal skill, which debuted in Fire Emblem Heroes. It exists in a three-tiered form, with the tiers respectively being named Squad Ace I 1, Squad Ace I 2, and Squad Ace I 3. The seal is functionally identical to the Speed + skill, simply increasing the unit's Speed stat by up to three points while equipped, depending on the seal's tier; however, it is not counted by the game as a duplicate of the Speed + seal or the functionally-identical Squad Ace D, N, S, or X seals, and so the player may legally possess all seals at the same time.
The Squad Ace I 1 seal may be obtained upon successful completion of the ninth Squad Assault challenge; it is one of the Sacred Seals that cannot be initially created through the Sacred Seal Forge. Tiers 2 and 3 must be obtained via forging in the Sacred Seal Forge.