Dark Ruler Ha Des

This card’s effect includes itself, as long as it remains a Fiend.

Flip Effects and effects that activate in the GY WILL be negated. This includes Sinister Serpent, Sangan, Witch of the Black Forest, Marie the Fallen One, ...

Monster effects that activate after damage calculation will be negated if your Fiend destroys the opposing Effect Monster.

If Kisetai is attacked by a Fiend while Dark Ruler Ha Des is on the field, its effect prevents damage calculation, so it is not destroyed and its effect is NOT negated.

If Sinister Serpent, Twin-Headed Behemoth, or Marie the Fallen One is destroyed by a Fiend when this card is on the field, they will not activate on any following turn. So during your opponent’s next Standby Phase, and each of his/her following Standby Phases, they may NOT move Sinister Serpent to their hand, Special Summon Twin-Headed Behemoth, and they will NOT gain Life Points by the effect of Marie the Fallen One. This negation continues even if Dark Ruler Ha Des is later removed from the field. (continues)