I thought you were in the mine with the missing undead? (west of Lovis' tower, a bit south of the fortune teller)
I didn't use the creature all the time, but for the rest of Broken Valley I just automatically used a warrior head. In the fjords trying to take out some level 21 imps at level 17, I found the creature much more helpful with a level 2 ranger head than a level 6 warrior head (didn't have a mage head at the time, but I switched as soon as I found one).
