Keen Weapon

School: transmutation
Circle: arcane 3rd, bardic 3rd
Spell Components: V, S
Action Time: 1 action
Range: touch
Shape: touch
Targeting: self, allies
Base Duration: normal
Saving Throw: will (harmless)
Spell Resistance: yes
Ritual Components: any enchanted whetstone

Scribes a guiding rune on weapon, granting doubled threat range.