Pilgrim Bellclaire is a white phantom available for summoning in the Lost Bastille area. A cleric wielding both a catalyst and a chime, she is useful to a certain degree against the Ruin Sentinels, but only as a ranged ally. While she is capable of casting Soul Arrows and Soul Spears, which provide a welcome distraction against three-on-one odds, she will fall quickly should she be caught in the crossfire of two or more of the sentinels in a melee situation.
Unfortunately, Bellclaire has a tendency to jump down from the ledge where the first Ruin Sentinel is fought, often leading to her own demise.
Her sign is located in a cell immediately before the Ruin Sentinels fog gate.
Her sign is also present before the dual Dragonslayer boss fight in the Drangleic Castle.