Rilk was a two-handed mace with a thick, slightly bent shaft of bone, horn or antler for a haft, "polished amber by antiquity". The based was capped by "a gnarled socket of bronze". The head was vaguely shaped to form four battered bulbs and made of deep blue, mercurial metal known as skyfall which was said to be harder than iron.
Rilk had originally belonged to a First Hero Thelomen Toblakai who used it to slay the dragon Dralk. Ublala Pung, led by Harlest who was in turn prompted by the ghost of Old Hunch, opened the sarcophagus of the First Hero and removed Rilk along with items of armour.