Keen Hearing and Smell - The diomwul has advantage on any perception checks relying on hearing or smell.
Pack Tactics - Often appearing in groups of 2-5, the diomwul has advantage on an attack roll against a creature if at least one other diomwul is within 5 feet of the creature and is not incapacitated.
Deadly Fluids - The diomwul's blood and saliva are highly acidic and poisonous respectively. On every bite attack, the creature being bit must make a DC15 Constitution saving throw. On a failed save, the bit creature takes 1d6 poison damage at the end of every round, adding 1d4 for every following failed saving throw. Unless treated with Anti-Venom, Greater Restoration, or another powerful healing spell, the victim will be dead in 2d4 days.