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As far as I remember, the quest also requires bringing some artifact to Phil Necrosov, after which he will offer two paths to the underworld: a physical one – through the gates, and a spiritual one – transferring the soul. If you choose the path through the gates, they will open on the map.
I can't say for sure right now – I'm not at home, I'll clarify later.
I can't say for sure right now – I'm not at home, I'll clarify later.