Card Rules: Rulings powered by The Netrep API. A cost is not damage so this card's effect does not apply against 'Chain Energy', or costs for 'Imperial Order', etc. [Re: Barrel Behind the Door] If you re-direct damage to your opponent using 'Barrel Behind the Door', and you have 'Dark Room of Nightmare' on the field, then 'Dark Room of Nightmare' inflicts 300 more damage. [Re: Magical Thorn] Even though 'Magical Thorn' does damage per card discarded, it deals the damage as one lump sum for effects like 'Dark Room of Nightmare'.
Set: Structure Deck
Card Number: SD3-EN022
Card Text: Each time damage, except Battle Damage, is inflicted to your opponent's Life Points, inflict 300 points of damage to your opponent's Life Points. This card's effect is not applied to the effect of 'Dark Room of Nightmare'.
Card Type: Continuous Spell
Name: Dark Room of Nightmare