The site consisted of a semi-circle of stone boulders, all long-shattered as if by some titanic explosion, half-buried by grass and brambles. At the center was the Anvil itself: a pair of megaliths, one lying on top of the other, amidst patches of nettles. The upper stone was black and marbled all over with white stripes—this type of stone was unique, not found anywhere else in the Iltkazar Range.
In the Year of the Wrath Sword, 275 DR, on the night of the Feast of the Moon, many senior priests of the Church of Ilmater gathered at Allyn's Anvil, including Archsufferer Irmakul "Bloodthews", Revered Brother Filithan, and Exalted Servant Volshur the Crooked. Here, making impassioned prayers and howls of suffering, they enchanted the sword Dornavver, the Demonbane.