The following video shows how to obtain the weapon Avelyn in Dark Souls.
This weapon is a little bit hidden and not easy to get.
In order to obtain the Avelyn you need to rotate the stairs in the Duke's Archives and then jump at the right time. You will jump on a shelf. On that shelf you will find a chest containing the weapon.
The Avelyn is a fantastic complementary weapon that shoots 3 bolts right after another.

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