Battle Standard of the Fallen

Wondrous item, very rare (requires attunement)

The battle standard of the fallen warrior calls the spirits of those fallen in battle to rally for one last fight. By planting the standard firmly into the ground as a standard action, you call this army to battle. After the battle has finished, the spirits dissipate.

The army of the fallen contains semi-corporeal manifestations of warrior’s spirits, which flock to your aid. While holding the banner, you gain the ability to cast spirit guardians once, requiring concentration as normal, and regain the ability to do so after a long rest. Holding the banner occupies two hands, unless you are large size or larger. Once it is activated, you may plant the banner on the ground as an action, at which point the spell is centered on the banner instead of on you. If the banner is knocked over (requiring a DC 10 Strength check), or you are disarmed, the spell ends.