If you have Helarjar Landing: Vrek quest in Stormheim you can farm Valarjar Soul Fragments on it.
Vaettfang can drop from 0 to 2 Valarjar Soul Fragments while Helarjar Landing: Vrek quest is active. To keep this quest from compliting you just don't kill Helya's Helarjar's (quest asks you to kill 10 of them).
Vaettfang coordinates 73.96 86.73
Respawn time 1 minute
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The Lost Army
Helarjar Landing: Vrek