The Northern Pylon accepts yellow, red, and green crystals.$B$BThe focus is the energy that can be created using yellow crystals as the main source of power. There are two possible effects: one that will produce damage, and one that will negate damage. $B$BCrystal Charge requires red and yellow crystals. This will produce a large explosion, stunning your enemies.$B$BCrystal Restore requires yellow and green crystals. This will provide you with a healing aura.