Level 3 allows you to drag a Tenebrium bar onto a weapon to add tenebrium damage
Get enough craft skill and Tenebrium +1. Drag bar on --- > the weapon, you receive "Not enough tenebrium" error message. Then Immediately drag the weapon on --- > the bar. And voila it works this way. :-]
Another good trick is Learn the skill by the book as the Raze told. AFTER THAT learn the skill by the quest in the mine vilage. If you do it this way you get Tenebrium skill lvl 2 for all your party members for free.
Maby the tenebrium infusion trick wroks with T=2 only. I has just two.
Anyway, Tenebrium weapons doesnt worth the real skill points.
