Axew (5e Creature)
From D&D Wiki
Small dragon, any alignment
Rivalry. When a creature hits the axew with an attack, it has advantage on all attack rolls against that creature until the end of its next turn.
Tusk. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) slashing damage.