There had been many adventures which Commander Shepherd had gone on to find a way to stop the Reapers, ancient machines which had a cycle of extinction which they used to murder any FTL society based on element zero. The fact the machines had mind control and advance weaponry as well as advance technology... made things much harder. So anything which might change the tide was willing to be investigated. Even long shots... like myths.
The Reapers had been legends and rumors, or even unknown by most civilizations, till they appeared. Till they killed. So why not look for myths and legends for something which might counter them, in hopes if it panned out it might be some kind of tech or weapon. A myth they were following, of a glove with six gemstones which could be used to control aspects of the universe. Time, Space, Reality, Power, Mind, Soul. Orange, Purple, Yellow, Red, Blue, Green.
This time they had a good lead to the location of these gems. Which caused Shepherd to lead an adventure to find the gems, leading some of his crew and friends to reach and collect the gems. The vow was to use the power of the gems to eliminate the Reaper threat once and for all. It didn't matter much what happened afterwards in Shepherd's opinion as long as the holder of the power of the gems could stop the extinction from coming.
Which was how one of crew members of the Normandy came across and put on the golden glove with the six gemstones on it. Five for each digit and one on the back of the hand. Gain the power of a God, removed the threat of the Reapers, saving the intelligent races of the galaxy!
They now just had to deal with the ultimate power in their hands, in the hands of...