Horde Empathy. The king rat can communicate simple ideas and emotions with rats of its horde within 100 feet of it.
Keen Smell. The king rat has advantage on Wisdom (Perception) checks that rely on smell.
Pack Tactics. The king rat has advantage on an attack roll against a creature if at least one of the king rat’s allies is within 5 feet of the creature and the ally isn’t incapacitated.

[b]Horde Empathy.[/b] The king rat can communicate simple ideas and emotions with rats of its horde within 100 feet of it.
[b]Keen Smell.[/b] The king rat has advantage on Wisdom (Perception) checks that rely on smell.
[b]Pack Tactics.[/b] The king rat has advantage on an attack roll against a creature if at least one of the king rat’s allies is within 5 feet of the creature and the ally isn’t incapacitated.

Actions

Multiattack. The king rat makes one attack with its Bite and one attack with its Claws.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6+3) piercing damage. If the target is a creature, it must succeed on a DC 11 Constitution saving throw or contract a disease. Until the disease is cured, the target can’t regain hit points except by magical means, and the target’s hit point maximum decreases by 3 (1d6) every 24 hours. If the target’s hit point maximum drops to 0 as a result of this disease, the target dies.
Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4+3) slashing damage.
Tail Sweep (recharge 6). The king rat sweeps its tail in an arc around it. Each creature within 10 feet of the king rat must make a DC 13 Dexterity saving throw. On a failure, a creature takes 14 (4d6) bludgeoning damage and is knocked prone. On a success, a creature takes half the damage and isn’t knocked prone.

[b]Multiattack.[/b] The king rat makes one attack with its Bite and one attack with its Claws.
[b]Bite.[/b] Melee Weapon Attack: [+5] to hit, reach 5 ft., one target. Hit: 6 ([1d6+3]) piercing damage. If the target is a creature, it must succeed on a DC 11 Constitution saving throw or contract a disease. Until the disease is cured, the target can’t regain hit points except by magical means, and the target’s hit point maximum decreases by 3 ([1d6]) every 24 hours. If the target’s hit point maximum drops to 0 as a result of this disease, the target dies.
[b]Claws.[/b] Melee Weapon Attack: [+5] to hit, reach 5 ft., one target. Hit: 5 ([1d4+3]) slashing damage.
Tail Sweep (recharge 6). The king rat sweeps its tail in an arc around it. Each creature within 10 feet of the king rat must make a DC 13 Dexterity saving throw. On a failure, a creature takes 14 ([4d6]) bludgeoning damage and is knocked prone. On a success, a creature takes half the damage and isn’t knocked prone.