Sextans Luna is a support centered on action economy, and she is one of the few low-rarity units with lasting practical value. While most B-rank characters are quickly replaced, Luna remains relevant in many teams because granting an extra move can fundamentally change turn tempo.
At max available values, Star Fate Prayer is her defining tool: it can grant an ally one extra action if they avoid new debuffs before acting, while also boosting both P.ATK and C.ATK for consecutive actions. This makes her especially strong with carries or controllers that gain huge value from taking two turns in a row. Vast Galaxy offers a small chance to grant two extra moves, but this is a low-probability bonus rather than a reliable plan. Her basic skill contributes minor chip damage and a mark, but her real impact is entirely tied to tempo acceleration.
Luna is a exception similar to other core utility picks, offering genuine strategic value beyond early progression. She is still vulnerable to disruption because her prayer condition can fail, but in properly protected setups she remains a highly efficient budget support even when compared with many higher-rarity alternatives.
