Hosidius Letter can be found in the library of Arceuus House, Great Kourend. The letter contains a plea from Lord Hosidious IV towards the Council of Elders to grant more land for the Hosidius House: explaining the Hosidius House's governing area's larger size relative to the other houses'. The letter is one among the items library customers may ask from the player to be delivered towards Arceuus House Favour.