In melee, a nawidnehr's jagged teeth and powerful jaws can tear away huge chunks of flesh, producing wounds that bleed profusely. A nawidnehr can swallow a man-sized or smaller creature whole on any attack roll that exceeds the minimum number required by 5 or more. For example, if a nawidnehr attacks a sahuagin (AC 5), it swallows the sahuagin whole on a roll of 9 or higher.
A nawidnehr's stomach can hold two man-sized creatures at once, or the equivalent volume of smaller creatures (about four small or eight tiny creatures). Swallowed victims suffer 15 points of damage each round they remain inside the sharkwere. A swallowed creature can wield natural claws or small-sized slashing weapons (type S) normally against the creature's internal Armor Class of 5. Larger weapons inflict only 1 point of damage per attack, plus any modifier for enchantment. No other damage bonuses apply. Victims escape after inflicting 20 points of damage; only one half of this damage total actually applies against the nawidnehr's hit points.