Thief of Wits
After receiving a vision from Tzeentch about the Malign Portents he did a ritual and consumed rune-branded Scarabach Beetles and called a meeting between the Gaunt Summoners to discuss the vision. After a brief discussion he convinced the others to reorient their plans so they would take this vision in consideration. Afterwards he observed the warriors within his Silver Tower and took notice of the threads of fate of a Skaven Deathrunner and started weaving plans.
He has spider-like fingers.