The Thirteen Month Series

Lore & Background

The Thirteen Month Series was forged by the Workshop in the Tower's primordial age, when the Great Warriors were still climbers, not kings. Each weapon was named after a month of the Tower's calendar and infused with a fragment of its first wielder's soul, granting it a sentient will that can grow, change, or even defy its owner. The weapons are as varied as the months themselves: the Black March, a needle-like sword that can shrink to the size of a pin or extend into a deadly lance; the Green April, a whip-blade that coils and strikes with serpentine precision; and the Yellow May, a radiant weapon said to pulse with healing light. Each carries its own personality—some aloof, some wrathful, some mournful—and they remember every hand that has held them.

Reader's Guide

The Thirteen Month Series are Ignition Weapons, meaning they can be 'ignited' to unleash their full potential—but ignition demands more than raw shinsu strength. It requires a compatible personality, a bond of trust, and often a willingness to surrender part of oneself to the weapon's will. Each weapon has a signature ability: the Black March can pierce virtually any defense, the Green April can bind and constrict with crushing force, and the Yellow May can mend wounds and restore vitality. However, these weapons are notoriously picky—they can reject a wielder outright, or worse, corrupt them over time. The series is also rumored to be tied to the Tower's ultimate lock: gather all thirteen, and you might unlock the final floor, or gain control over the Tower's very structure. Currently, most are held by the Ten Great Families, but a few—like the Black March—have been entrusted to Regulars as tests or rewards, making them the spark for countless battles and conspiracies.

Did You Know?

• The Black March was given to Baam by Headon, the Guardian of the First Floor, as a test of his worth—and a curse he never asked for.
• The Green April was wielded by Yuri Zahard, a Princess of the Zahard Family, who often treats it more like a stubborn pet than a weapon.
• Some weapons, like the White February, are said to have been lost or destroyed during ancient wars, but whispers persist that they merely changed hands in the shadows.