Mason:
I am too weak to lift a simple spear, but my hatred burns brightly for those who killed my family. I beg you. Please avenge my family. Once you bring back 100 heads of the Bloody Axe bodyguards I will be able to die in peace.
Those Ol Mahums are staying in the Plains of the Lizardmen, southern part of Oren. You will find their army post when you travel north from the Death Pass of Giran.