The Mourner trousers are part of the mourner set. To obtain them, players must kill a level Mourner on the path to Prifddinas. However, the Mourner will bring all combat stats down to 20, so it is recommended players bring a stat restore potion before fighting. They will need to be repaired to be of any use, becoming mourner trousers.
When the player first obtains the trousers they are damaged and must be repaired. Players need to take 2 silks and a bear fur to Oronwen, the Elven Seamstress in Lletya, to have the trousers repaired. She requires around 2 minutes for each set of trousers you wish to repair.