|This article is about a/an weapon in Kamen Rider Gaim.|
The Dau (ダウ) is Redyue's spear (槍 sō) weapon with two Helheim's Fruits on it, which allows the user to control Helheim flora and fauna, or listening human's footstep sound from another Heiheim's fruit by connect. It was destroyed by Gaim Kiwami Arms's Orange Charge. However, Ryugen Yomi later summoned another copy of it as an Arms Weapon.
- This weapon resembles a Chinese halberd, Ji.