SPOILER UP AHEAD SO DUCK
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If you have the horn of Valhala you can use the diamond to upgrade it...after that you can use the berluji gem to do the smae and make it even better
Now the horn calles furth a beserker thatīll fight for you once per day...heīs pretty good in a tight spot and everybody can use the horn.
LOCATION on the horn...
The horn is in a house behind the fish-seller in the brigde district...BUT watch it
DavidEddingsRules