NutInMyCrosshair

For red essence, use the item to make you glow and then interract with the right eye of the dragon head under the crucible

For orange, go to geode topside and find one of the spirals that takes you underground. go as far down as naturally allowed and then bomb towards the center to find the orange

For yellow, interract with a block ganda spawns

For green, interract with the green faeflower pip once fully grown