To the Lord Protector is a written note found in Dishonored.
We are servants of the Empire and of the true Empress, a group of loyalists who want very much to meet you. Take these weapons, crafted for you from the finest materials in the Isles, and meet with our man, Samuel, near where these tunnels spill into Wrenhaven River.
All haste and luck. We share a common purpose.
It can be found in the Dunwall Sewers on top of the supplies chest during the mission Dishonored.