During last week's session, a discussion arose regarding an old campaign. In that campaign, there was an encounter where the party engaged a pair of "Drowned" (see MM III). The party members were under the effects of Potions of Water Breathing at the time and moved to engage these udead. It seems to me that the Drowning Aura given off by these undead, is a supernatural ability. Would the potions of water breathing negate this aura?