Rune King Thor, Old King Thor, Galactus, Surtur, Odin & Zues
All of these high tier Skyfather level beings come together as one. They want to rid the Universe of all the Celestial beings and remain as gods with dominion over their various homes and Universes. Hence, they acquire the most powerful artifacts they can get and proceed as planned:
Rune King Thor (Power Gem)
Old King Thor (Necro-Sword, Belt Of Strength & Warrior's Madness)
Galactus (Fed on 4 Planets)
Surtur (The Twilight Sword)
Odin (Destroyer Armor, Odin-Sword, Asgard & The Uni-Mind)
Zues (Fully Powered)
The Celestials comes in waves of a host of 9.