TCG Rulings[]
- It activates immediately at the start of the Damage Step. [1]
- If you attack a face-up monster and then activated "Book of Moon", if the attack target monster is in face-down Defense Position at the start of the Damage Step you can use this card’s effect to destroy it. [1]
References[]
- ↑ 1.0 1.1 1.2 Konami Gameplay FAQ: Storm of Ragnarok -- Card Rulings (Version 1.0)