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Combat boosts (not to be confused with  bonuses) refer to specific versions of boosts that are only active during combat, and will not be visible in the menus displaying units in battle. The name comes from various sources such as skill descriptions describing stat increases as boosts, and the multiple focuses localized as "Heroes with Combat Boosts", featuring combat boost skills. Typically the description of these skills will include the phrase "during combat".

The influence of combat boosts can be observed during pre-combat confirmation, allowing the player to evaluate their options.

Combat boosts are primarily given by A Type passives for the user, and C Type passives for allies, while weapon skills and Sacred Seals often provide combat boosts for their users or their allies.