"Little is known about the entity known as Numinus the self-proclaimed guiding spirit of the Universe. Numinus has claimed to be the living embodiment of numinosity, a guiding spirit presiding over the affairs of sentient beings throughout the universe. Her only apparent purpose is to manipulate the activities of sentient beings throughout the universe and reawaken them, to whatever degree they may be made aware, to the wonder in the universe. She does so by searching for sentient beings in desperate situations, and, through her manipulations, bringing events to an improbable but awe-inspiring resolution." - Official Handbook of the Marvel Universe #5
Upon meeting Groot, Numinus had a lot of self-doubt if her powers do any good for the universe. Groot told her about all the great things she's helped kickstar giving her more self confidence. Numinus thankful to Groot decided to aid him in his mission to save his friend Rocket from Eris who was using him as bait to catch Groot himself.