So I'm level 30 and on the quest [sorceress] Desire For Power and the black spirit is telling me to enhance the basteer weapon but i dont have one nor know where to find it... Any ideas on whats happened and how to sort it out???

If not mistaken it was a weapon from a quest you had to enchant it if not mistaken when you do the quests in the castle with the happiness try sweeping the main story to see what quest gave the weapon or if one of the npcs sells it.