The Amell Estate Cellar is the basement of the Amell Family Estate. It can only be accessed during the relevant companion quest in Act 1.
Involvement[]
This section contains spoilers for: Dragon Age II.
Hawke and their sibling (Bethany for a non-mage or Carver for a mage) must find Leandra's father's will, which reveals that Gamlen was not the Amell heir, but rather Leandra was. After recovering the will, a dialogue with your sibling can return you to Gamlen's House.
Birthright
Portrait of the Past (with Bethany)