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

Insatiable Bloodlust. When the gnoll is reduced to half hit points or fewer (24 or less), it enters a frenzied state. When the gnoll hits with any weapon, the weapon deals an additional die of damage of the weapon's type (included in the attack).

Multiattack. The gnoll makes two attacks, either with its glaive or its longbow, and uses its Incite Rampage or Pack Cackle if it can.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 5 (1d4 + 3) piercing damage, or 7 (2d4+3) while Insatiable Bloodlust is active.

Glaive. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 8 (1d10 + 3) slashing damage, or 13 (2d10+3) while Insatiable Bloodlust is active. 

Longbow. Ranged Weapon Attack: +4 to hit, range 150/600 ft., one target. Hit: 6 (1d8 + 2) piercing damage, or 10 (2d8+2) while Insatiable Bloodlust is active.

Incite Rampage (Recharge 5–6). One creature the gnoll can see within 30 feet of it can use its reaction to make a melee attack if it can hear the gnoll and has the Rampage trait.

Pack Cackle (2/short rest). Choose up to five allies within 30 feet of the gnoll pack lord. Each of them gains 8 temporary hit points. When a creature gains these temporary hit points, it can immediately use its reaction to move up to its speed, without provoking opportunity attacks.