Can-Toi

Keen Hearing and Smell. Has advantage on hearing or smell checks.

Sunlight Sensitivity. While in sunlight, the can-toi has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Multiattack. can make two melee attacks as a action.

Dagger. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 2) piercing damage.

Hand Crossbow. Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Whip. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 6 (1d4 + 3) slashing damage.

When a Can-Toi loses half or more of its HP,  the mask comes off, exposing its true rat face, and it gains another attack option (Bite): 

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage. If the target is a humanoid, it must succeed on a DC 13 Constitution saving throw or be cursed with Fever. A raging fever sweeps through the target’s body. The target has disadvantage on strength checks, strength saving throws, and attack rolls that use strength.

At the end of each of the target's turns, it must make a constitution saving throw. After failing three of these saving throws, the disease's effects last until the next long rest.

Since this spell induces a natural disease in its target, any effect that removes a disease or otherwise ameliorates a disease's effects apply to it.