In the mission 'Dark desintegration', after receiving the Soul net you must enter to Fiehonja
Your objective is to purify the piles of Deepling Spawn (Cursed) by using the soul net on them (you may repeat this mission as many times you want)
You must wait 5 minutes after the final purification for the evil Deepling spirits to regenerate. Rarely, purifying the final spawn will yield a Small Golden Anchor
For receiving the small golden anchor you need to do the Soul Net Mission.
According to Tibia Wikis Quest Spoiler for Liquid Black Quest you can do this mission at any stage:
And here is written how the mission works: Spoiler for Soul Net mission
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