Master Terry:
Since there is no time, I don't think it is a good idea to search for them randomly. Listen carefully.
First, the Ol Mahum Captain can be found near the Partisan's Hideaway in the north-east.
The next place is Gludin Village, which is a bit far from here. I guess you can clearly see now, that these mutations sprang out from several places around the world. You will be able to meet the Turek Orc Warldord at the Orc Barracks in the northern part of Gludin Village.
I bet you have been to the Wastelands of Gludio before? It is where there are a lot of huge insects... Find the Ant Captain there. You'll be able to find him better in the underground Ant's Nest rather than the Wastelands above. But the Ant's Nest is an extremely dangerous place so you'd better not go in there alone.
And last, the most dangerous of them all... Have you ever seen the so-called Turek bugbears while you where traveling around Giran? Turek bugbear Warrior are the leaders among the beasts.
Now then, let's get on with the work. You go there now. I shall follow you soon after..