When you level up in Mina the Hollower, you can level up one of three different stats: attack, defense, or sidearms. Defensiveness can be useful, but perhaps attack will prove to be the best form of defense. Sidearms, too, can come in handy, but they may not be the most reliable stat to focus on. If you’re unsure which stat to prioritize, you can also choose a fourth alternative — bonestone.