Shapechanger. The ghuuna can use its action to polymorph  into a Large hyena-humanoid hybrid or giant hyena, or back into its true form, which is humanoid. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.​ 

Keen Hearing and Smell. A ghuuna has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Iron Vulnerability A ghuuna's damage immunity does not protect it from bludgeoning, piercing and slashing damage from nonmagical weapons made of cold iron or meteoric iron.​

Rampage. When the ghuuna reduces a creature to 0 hit points with a melee attack on its turn, the ghuuna can take a bonus action to move up to half its speed and make a bite attack.

Multiattack. The ghuuna makes two attacks: one with its bite and one with its claws.​ 

Bite (Giant Hyena or Hybrid Forms Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 14 (3d4 + 7) piercing damage in giant hyena form, or 7 (1d6 + 4) piercing damage in hybrid form. If the target is a humanoid, it must succeed on a DC 15 Constitution saving throw or be cursed. Gnolls are cursed with ghuuna crocutanthropy while other humanoids are cursed to contract a random disease (roll 1d4 with 1=filth fever, 2=mind fire, 3=seizure, 4=slimy doom) with effects as described in the contagion spell. The diseased target must immediately make another DC 15 Constitution saving throw or be poisoned. This disease lasts for 7 days or until it is cured. Every 24 hours the target can repeat the saving throw to either remove the disease's poisoned condition or, if they are unpoisoned, be cured of the disease.

Claws (Hybrid Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 6 (1d4 + 4) slashing damage.

Greatsword (Gnoll Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 14 (2d6 + 7) slashing damage.