The Stoneweaver pendant is an amulet that establishes a magical connection with stone-based entities, enabling the wearer to communicate and exert control over them. It is linked to Stoneweaving, a form of magic that influences stone and earth elementals. Sylvie used the pendant to command a stone-bodied sentinel and a larger stone elemental known as the Living Fortress.
While exploring a cavern, Sylvie activated the pendant to command a spear-bearing statue, instructing it to hold its position. After successfully controlling the sentinel, she passed the pendant to Heyou, allowing him to pilot the Living Fortress remotely. This control was crucial in navigating obstacles, including relocating a hooded figure that blocked the party's path across a bridge.
The pendant provided strategic advantages during encounters, enhancing the party's interactions with stone entities and aiding their journey through the cavernous landscape.