The tag appears as a circular wooden disc, its face carved in relief showing the profile of an ancient guardian spirit with piercing eyes. The wood displays the concentric rings of an old-growth tree, and tiny moss-green inlays mark the boundary edges. It emits a low vibration when challengers approach the holder's claimed ground, and remains warm to the touch as if containing living energy. Despite passing through countless challenges, it never shows damage.

The Grove Sentinel serves as the ultimate defensive badge in the Stumptown Settlement - holders are recognized as those who have never let their territory be taken, or who have reclaimed it so many times the land itself acknowledges their dominance. It represents the highest form of territorial invincibility.