Cannot be Special Summoned. Monster effects cannot be activated.
When an opponent's monster declares a direct attack: You can Special Summon this card from your hand, then end the Battle Phase. If Summoned this way, banish it when it leaves the field.
If Majesty's Fiend on field, can Battle Fader be special summoned and end battle phase by its own effect? I'm not sure if Battle Fader's effect is active or passive effect?