Mighty Militiaman

Talking to Oto, you learn that several Brakmarian warriors fell and were left for dead on the road to Astrub. Also, Oto Mustam wants a Whitish Fang soul for reasons which are not entirely understood. So, go out and soul one. When you bring it back to Oto, you receive in exchange a Newly tamed Whitish Fang following character; it's up to you whether or not you go show it off to your friends. Once you decide to get started, [-10,-20] on the north edge of the Treechnid Forest is where the ambush took place. Go one map to the right and click on the giant glowing building; you'll 'climb' it and see a Bontarian fleeing to astrub, intercept him at [-5,-23].

You can choose to attack the Powerful Bontarian Militiaman or flee. I would assume that if you choose the first option you fight him, but since I ran away, that's just a guess. Fleeing finishes that step of the quest, so go see Oto and you'll lose your furry friend and gain alignment level 56.