He was an ancestral dwarf God in the Old world along with Grimnir and Valya.
every Incarnate who got bounded to a realm are consider to be big Gods in AoS. All of them except GorkaMorka where once mortal being in the Old world. Sigmar, Grugni, and Grimnir where venerated enough to become gods by their race after they pass on. Nagash, Tyrion, Allareille, and Malerion became Gods during or after the Endtimes. Teclis somehow became a God in AoS but Morathi didn’t get it until Broken realm.
The chaos Gods and GorkaMorka where born Gods and are classify as elemental Gods according to Warcom.