Merciless ones are aquatic parasitic aberrations in all likelihood related to  faceless ones. They are cycloptic, squid-like creatures with a body shape similar to Ozumat. They attach themselves to the heads of things to enslave them, and can affect their host's mind even when "dead." As the Beak of the Merciless One shows, they have beaks.
Erunak Stonespeaker was abducted by the Naga and enslaved by the Merciless one Mindbender Ghur'sha within the Throne of the Tides. In Twilight Highlands the Merciless one Julak-Doom is controlling a flesh giant.
Merciless One yells: DIE.
Merciless One yells: I COME FROM BELOW.
Merciless One yells: I SEE YOU.
Merciless One yells: INSIGNIFICANT MORTALS.
Merciless One yells: YOU WILL NOT SURVIVE.
Merciless One yells: YOU WILL SERVE ME AND THEN DIE PAINFULLY.
Merciless One yells: YOUR SIMPLE MIND CANNOT GRASP WHAT IS TRANSPIRING.
Merciless One yells: YOUR WORLD CRUMBLES BEFORE YOU.
This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
They may be a cousin species to the Faceless Ones, also an ancient aquatic like species who serve the Old Gods.
They may also be related to the kraken, Ozumat is called this, but given his ability to attach to victim's heads and control them, he is also thought to be a large variant of Merciless One.
The merciless ones resemble the Daleks of the popular British science fiction program, Doctor Who.
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20px Wowpedia on 29-Sep-2011. See list of authors.