Sharpen

Regular 
Temporarily produces an extraordinary sharpness on cutting and impaling weapons. +1 or more to basic damage.

Duration: 1 minute. 
Cost: The formula is 1 energy for every 6” of edge. Typical costs (use these unless the circumstances are very special): 1 to cast on an arrow; 2 for a knife, spear or axe; 3 for a one-handed sword; 5 for a two-handed sword. Double these for +2 bonus, or triple for +3. Half that (round up) to maintain. 
Time to cast: 4 seconds. 
Prerequisite: Repair.

Item 
SeePuissance. If a weapon already has the Puissance spell on it, the spells don’t add; only the stronger one works.