Royal Command

 This card appears in the artwork of Trap Stun.

In the TCG, "Royal Command" prevents the activation of Flip monsters' effects as well as negating their effects.
In the OCG, "Royal Command" negates the activation and effects of Flip monsters' effects.

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OCG Rulings

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This card cannot be activated during the Damage Step. (If "Royal Command" is already face-up on the field, the activation and effect of Flip monsters' effects that are activated during the Damage Step are negated.): Royal Command

The effect to negate the activation and effect of Flip monsters' effects does not start a Chain Link.

If "Royal Command" is face-up, the activation and effects of all Flip monsters are negated. (If the Flip monster has a Continuous Effect, etc. it will also be negated.) Therefore, if "Royal Command" is face-up, not only will it negate the activation and effect of the effect of "Night Assailant" that activates when it is flipped face-up, but also the activation and effect of the effect that activates when it is sent from the hand to the Graveyard.: Which effects of "Night Assailant" are negated by "Royal Command"?

If "Royal Command" is face-up, the activation and effects of all Flip monsters are negated. (If the Flip monster has a Continuous Effect, etc. it will also be negated.) Therefore, if "Royal Command" is face-up, not only will it negate the activation and effect of the effect of "Slate Warrior" that activates when it is flipped face-up, but also the effect that activates when it is destroyed by battle

Previously Official Rulings

This card can be chained to the activation of a Flip Effect from a Flip Summon to negate the Flip Effect. It cannot be activated during the Damage Step, so if a Flip Effect Monster is flipped face-up when attacked you cannot chain "Royal Command" to negate its Flip Effect.

If "Royal Command" is active on the field both players may still Flip Summon monsters, but any Flip Effects are negated.

Mentions in Other Rulings

Amplifier"Jinzo with Amplifier", your Trap Cards are not negated and their effects are applied, including "Royal Command"

Dark-Eyes Illusionist: If "Royal Command" is actived after "Dark-Eyes Illusionist's" effect resolves, "Dark-Eyes Illusionist's" effect is negated.