Find All 4 Ghostly Echoes

Journal
''Esmeralda informed me that discovering all four ghostly echoes might enable me to actually speak with the entity, and the resulting bond would inspire it to give me a boon which could aid my fight against something called a geistesser. I should search Highvale Outskirts and find all four ghostly echoes. Since the ghostly echo glows, I may have better luck searching at night.''