Basil, Sprigg's Homunculus

Telepathic Bond. While the Basil is on the same plane of existence as its master, it can magically convey what it senses to its master, and the two can communicate telepathically.

Unarmored Defense. Basil's armor class is equal to 10 + Constitution modifier + Dexterity modifier 

Fastest Plant in the Tower. Basil's walking speed is equal to 80 ft.

Photosynthesis. When Basil would take radiant damage he instead regains hit points equal to the damage roll. 

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 1 piercing damage, and the target must succeed on a DC 10 Constitution saving throw or be poisoned for 1 minute. If the saving throw fails by 5 or more, the target is instead poisoned for 5 (1d10) minutes and unconscious while poisoned in this way.