Dravis' Letter is a quest item found on a Lectern in the Burning Cellar within Malmouth Outskirts. The item is required for the A Sister's Love quest.
Dear Sister,
again I find myself at a loss of words. Why is it that you defy your very blood? Why do you forsake your brother when I am so close to the truth?
But no matter, I shall tear it out of our father's dying breath with or without you. If you are reading this, then you are again too late, for I have ventured where the dead dare not, where the blood of the living is joined with the master. The time to join me has passed, Daila. Turn back, for where I go, you cannot follow...
Dravis