A closer inspection of the pylon leads you to find a small table containing blue, yellow, and green crystals arranged in what seems like a specific formation.
A large blue circle of crystals is flanked on either side by a smaller circle of yellow crystals and another of green crystals.
You carefully take note of the colours of the crystals, knowing that J. D. would be very interested in hearing about what you have found.
J.D. explains
The Eastern Pylon accepts blue, yellow, and green crystals.
It focuses on the energy that can be created using blue crystals as the main source of power. There are two possible effects: one provides bonus to spirit, and one that creates a damaging shield.
[Crystal Force] requires blue and green crystals. This will provide you with an increase in spirit.
[Crystal Spire] requires blue and yellow crystals. This will creaste a shield that does damage to attackers.