Slaying Trigon

The Infinity Stones people knew of numbered six in total. They were fragments of Nemesis's power, scattered throughout the multiverse. Many universes possessed six Infinity Stones. So, in theory, many people had the chance to obtain the Infinity Stones. In the main universe, Donnie was gathering the Infinity Stones. In another universe, Thanos or someone else might have gathered all six stones. The seventh was the Self Stone, the key to awakening Nemesis. There was only one such stone in the entire multiverse.