Krol

Krol was the leader of the ogres initially approached by the Blackrock clan who were seeking to form an alliance during the forming of the Old Horde. The Blackrocks captured three members of Krol's clan and convinced them to hold council with their leader. Krol, promised protection from the gronn, as well as a new "enemy" called the draenei in which to kill, quickly agreed and formed an alliance with Orgrim Doomhammer, who had been sent there by Blackhand. Krol then joined the Old Horde with his followers.

After the destruction of Draenor, the Boulderfists who had remained on the planet settled in Nagrand, and had dominion over all ogres in the new Outland. Recently, Krol has gone mysteriously missing and a new clan, the Warmaul, have begun forcing his clan out of their lands. The cunning half-orc Lantresor of the Blade has stepped up and taken leadership of the clan.

• Rise of the Horde never mentioned that Krol was a member of the Boulderfist clan. It was the Success! (Horde) quest which explained it.
• The Krol Blade may or may not be named after him.
• Both him and the blade may be named after Blizzard employee Monte Krol.