The Eastern Pylon accepts blue, yellow, and green crystals.$B$BIt 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.$B$BCrystal Force requires blue and green crystals. This will provide you with an increase in spirit.$B$BCrystal Spire requires blue and yellow crystals. This will create a shield that does damage to attackers.$b$b