The Mark of Tarakudo is a magical symbol bearing the face of Tarakudo, King of the Shadowkhan and Lord of All Oni. The mark will appear if one were to attempt to summon the Shadowkhan to do their bidding.

Any human who tattoos this Mark will gain the ability to summon and control Shadowkhan without wearing an oni mask or using a dark spell, but doing so will gradually turn them into an evil demon with blue skin, red eyes, and fanged teeth, making them resemble a Shadowkhan themselves. The Mark cannot be removed unless a magical potion is used or by a magic spell in sealing Tarakudo and shadow magic away.

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