Objectives
Speak to the quest giver to complete it.
Progress
The Pylon table allows you to combine green power crystals with yellow power crystals.
According to J.D.'s manual, this combination can be used to heal yourself or your allies.
Completion
Arranging the crystals on the table, you carefully align the colors. As you push the last one into place, a burst of light fuses the crystals together.
The resulting combination is now yours.