Tags

Tags(タグ,Tagu) are a -esque marker used for an Ultima Summon. They are placed on the field through various effects. Like, Tags are not actual cards that are placed in the Main or Extra Deck. Instead, they can be represented by any viable item. Dis-similarly to Token Monsters, Tags are not placed ON the field, but rather "under" Monster Zones.

Tags' role in Ultima Summoning is that the number of Tags in a Monster Zone is divided by the Level/Rank of the monster that is in the same Monster Zone as the Tags being used for the Summon.

In Yu-Gi-Oh! Duality of Demon, Tags are represented by glowing, golden spheres that float around. Whenever a Tag(s) is placed on the field, it will float around the card (or monster in some cases) that placed it on the field for a few moments and then fade away. When Tags are being used for an Ultima Summon, they float in a large circle around the monster being used while the monster beings to rise into the sky. The monster being used for the Summon is then engulfed in a bright light. The Tags then disappear and the Ultima Card appears in their place. If a Tag is removed from the field, it simply floats up from the ground into the sky and fades away.