×The item you're thinking of is poison. To get it, you'll need to go to Andvari's house in Svartlfeim and rearrange the puzzle pieces so that they form a path to the ice wall. Go to the ice wall and climb it.

For this next part, you'll need to be fast. In fact, it might help to set your movement to run and set the game speed all the way down. Wait for the lady to go back to Loki and start catching poison drops, then jump across the ledge and use an empty bottle on the snake to catch some poison yourself. Then get the HELL out of there!

Before facing Egther, use the poison on one of your throwing daggers.

×What good is it to poison a throwing dagger when I can't throw them?