Praecantatio is the "magic" aspect, composed of Potentia and Vacuos. This is a key resource, used in a variety of craftings. Large amounts are used in a few recipes, notably advanced Infusion Enchantments and (especially) Runic Augumentation. It has several common sources: Most plentiful in the early game is greatwood or silverwood logs (and saplings), but if those are not available, it can be obtained from chiseled sandstone, or mossy cobblestone. Once a Nether Fortress has been explored, it can be produced in massive amounts with a netherwart farm. It can also be centrifuged from Auram or Vitium, which may be plentiful in the late game.