Buying the Tower Key for 20,000 souls is one of the first things you should do in Dark Souls 3. Buying the key opens access to an Estus Flask Shard, a Covetous Silver Serpent Ring (+10% souls earned), item trading with the birds, the Estus Ring (increases how much health you gain from every Estus drink), the Fire Keeper Soul (necessary for Yoel’s sidequest), and the Fire Keeper armor set.
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