Kull
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Kull are especially large Urgals. Kull are born as Urgals, and through their growth, they grow progressively larger until they are above eight feet tall. They are then called Kull. This happens, according to Urgals, because the 'Old Blood' flows in their veins. Siblings of a Kull may not be a Kull, though it is unclear why. Nar Garzhvog is an example of one.
