Nestle
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Please help, I can't find the Archmage's Codex.
The Codex is hidden in a ship, near the island that was given at the beginning. You need to swim down from the mage, pass the landing site for the ship, and below, in the rocks, you will find the ship.
Added 4 minutes later
I found some amulet that needs to be taken to the altar.
And now I can't go anywhere else - there's ice blocking the way, in the dungeon on the island with the starting town.
The dungeon will open after you receive the quest to find the artifact. It's in that dungeon where the artifact will be.