ON THIS WIKI
Enervation Impulse is an enchantment to Ethereal Familiar, which will inflict Weakness, Slowness and Mining Fatigue to the targets it strikes. Each level will double the duration of these effects. In order to upgrade the Familiar with a certain level, it has to be already upgraded with the previous level of enchantment.
Thaumcraft 4 Research Notes
Where is your strength now?
"This upgrade removes the familiars damaging capabilities altogether and replaces them with ability to suddenly drain large amounts of energy targets. Enemies which are struck by Enervation familiars will become weak, lethargic, and very, very managable with a plain old sword.
Consumes 0.03 Terra and 0.03 Perditio Vis per attack and level."Aspect the Ethereal Essence is related to has to match the Aspect the Ethereal Familiar is related to and the 4th aspect in the recipe. In this article it is
Enervation Impulse I
Enervation Impulse II
Enervation Impulse III