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Doubts-the-Moon says some mercenaries in Stormhold are stirring up trouble between the Dark Elves and the Argonians. He asked me to convince some of the mercenaries around Stormhold to leave. Doubts-the-Moon said he didn't care how I did it.
— game journal
The mercenaries either leave, if the player pays a sum of money, persuades them (one needs the perk), simply talks with them or challenges them to a fight.