Forbidden Chalice

One face-up monster on the field gains 400 ATK, but its effect is negated until the End Phase.

• This effect targets a face-up monster on the field.
• If the target is not face-up when this effect resolves, that monster's effect are not negated.
• This effect only negates effects that activate / apply on the field.
• This effect does NOT negate monster effects that activate in the GY, like "Sangan".
• If a monster's effect allows it to attack directly, and "Forbidden Chalice" is activated during the Damage Step, resolve the attack. A replay does not occur.
• VS. Lonefire Blossom: If "Forbidden Chalice" negates Lonefire Blossom's effect," you can Tribute "Lonefire Blossom" as cost, but the effect resolves negated.
• VS. Beast King Barbaros": its ATK becomes 3400, then 3000 ATK after the End Phase.
• This card can be used in the Damage Step, but not during/after Substep 4 - Damage Calculation [REF].
• This effect expires during the End Phase like any other effect. Normal rules of priority apply, and the turn player must resolve effects first in the case of dual passing.