Also known as: ダークバイザーツバイ
A personal weapon of Kamen Rider Knight Survive.
It's the transformed form of Kamen Rider Knight's DarkVisor.
It's attached to his left forearm and can be separated into the sword Dark Blade and the shield Dark Shield.
It transforms into the Crossbow-like form Dark Arrow by using the Advent Card Shoot Vent, enabling it to shoot Energy Arrows.