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A creature with a damage requirement (almost always a non-player character) is immune to all damage from attacks that do not use a specific combat call (which will be listed with the damage requirement). If the correct call is used with a damaging attack the creature takes damage normally. A "No Effect" call must be made whenever an attack successfully hits you but does not inflict damage (or does not take effect in the case of spells) so that the attacker knows-that-you-know the attack successfully hit and so that they know they may need to attack with something different.
A damage requirement does not prevent effects that don't deal damage.