Loar Shades are undead creatures that can be found wandering Mort'ton. They initially appear as shadows and transform into shades when they are in combat. They can temporarily lower a player's Strength stat by 1 when they hit, but they cannot lower it further. They can also lower a player's Attack stat by multiple points. Loar Shades are capable of floating over water and can climb onto bridges that have gaps in the fences.
As they are undead, they are susceptible to the effects of Crumble Undead and the Salve amulet. They are also extremely weak to the Gadderhammer, although a dragon scimitar deals more damage on average.
These are commonly killed for the "shades" Slayer task that is given by Vannaka.
The best way to get to these is by using a Mort'ton teleport or Shades of Mort'ton minigame teleport (requires completion of the quest Shades of Mort'ton). Alternatively get a Barrows Teleport Tab and run southwest.
Safespot them using the stone stands found by the funeral pyres.