The final cosmic creature, Galactivus is the most powerful of the three. It is seemingly immune to the other’s powers and has the ability to cancel them out. It is said to be made of dark matter and can channel this mysterious substance as well as cosmic energy into devastating attacks. However, all of this information is based on one single sighting, when it appeared to stop a battle between Alctas and Matora over the crab nebula, thus it is considered the rarest of the three. Whilst the sighting and its reported appearance would suggest it to be a fearsome creature of immense power, it would seem to be a very shy creature, averse to conflict.
(Pictured alongside Alctas and Matora for scale reference).