Kaisel is a shadowSung JinWooobtained in theDemon Castle. Kaisel is the shadow ofKaisellin a Drake/Wyvern that Demon King Baran used as a mount. Source: Solo Leveling wiki Kaisel used to be a mount that the Demon King Baran rode in battle. After Sung JinWoos fight he looks around and found thatIronalready killed Kaisellin dragging his corpse towards Sung JinWoo. After he was extracted his grade was Knight which concludes he was at least an ARank.