Weapon Base Damage has no effect on this weaponskill (Damage appears to be solely based on INT/MAB).
The damage is affected by all the bonuses/penalties imposed on regular Dark-based spells.
Historical Background[]
"Vidohunir" may be a corruption of Vidofnir, or Víðópnir, a rooster that perches on top of the tree Mímameiðr (thought to be another name for Yggdrasil, the World Tree). It is mentioned in the Fjölsvinnsmál of the Poetic Edda.