In Skyrim, completing the Thieves Guild questline granted a bonus to illusion magic (fear, invisibility, calm, frenzy spells).
They should be given invisibility, and the description should state that they can infiltrate the enemy's rear using magical deception.
Added 5 minutes later
In my opinion, the blades of the one in the last screenshot don't match well (they don't match the outfit - it needs to be more concise).
Блистает там воздушностью прогалин.
Но между кедров, полных тишиной,
Расщелина по склону ниспадала.
О, никогда под бледною луной
Так пышен не был тот уют лесной...