When you reach mangement skill points, you should visit Vitality Master in Sanctum (Elyos) or Pandaemonium (Asmodians) to improve your essence extraction skill. Vitality Master is located in the crafting district. The same edit autocad commands
needs to be done at skill levels 199 and 299. Below you will find a inventory management project report pdf of all the gatherables in Atreia with links to maps that list all the spawn points.