Umbral Echo

The Umbral Echo is the Umbral ForestUmbral ForestContinent 22 different echoes to track3 different relics to dig upIts boss is Umbral Alpha's common track find, and of the whole catalogue it is the material that turns up on the same bill most often: both compass upgrades still ahead of you are paid in it, and between them they add up to 1,765 units. It falls in handfuls the moment you cross Portal 1 and sells for 20 Khron, so it looks like passing loot. What it actually is, is the foundation of the entire tracking ladder.