Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4+2) piercing damage, and the target must succeed on a DC 11 Constitution saving throw or take 10 (3d6) poison damage. If the poison damage reduces the target to 0 hit points, the target is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way.
Keen Smell. The rat has advantage on Wisdom (Perception) checks that rely on smell.
Pack Tactics. The rat has advantage on an attack roll against a creature if at least one of the rat's allies is within 5 feet of the creature and the ally isn't incapacitated.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4+2) piercing damage.
Spider Climb. The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check
Flaming Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 6 (1d8 + 2) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 7 (2d6) fire damage on a failed save.
Burning Web (Recharge 5-6). Ranged Weapon Attack: +5 to hit, range 30/60 ft., one creature. Hit: The target is Restrained by flaming webbing. While Restrained in this way, the target takes 3 (1d6) fire damage at the start of their turn. As an action, the Restrained target can make a DC 12 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10, HP 5, immunity to bludgeoning, poison, fire and psychic damage).