Ment
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The tavern keeper took a long piece of black cloth from a drawer and handed it to Mirna. — Put this on.
0. Advice is not given until accommodation in the "Abyss" is paid for.
1. Wait for the arena competitions and perform well (win?).
2. Kill some monster, like a dragon or something weaker.
3. Defeat Eric (judging by what is known, this is easier than point 2?).
But this was outside the template. Mirna examines the cloth and considers how best to put it on (should she tie it over her eyes?), if it even makes sense. If she doesn't understand, she asks what it is.