Level 26 is pretty low to take on the dragon terror patrol in DKS (
Orobas Crypt Power Ranger battle, please help). I was level 36 and they were not easy (they were not that hard, but I had to pay attention to the fight).
Have you been to High Hall and the harbour, cleared the depleted ore mine, the start of the waterfall cave, etc? There are also a few caves around the fjords (one near the source of the waterfall across from the grand knight shrine, another on a ledge left of where the anti-dragon shields ended around the bunker, etc).
Are you summoning your creature in the flying fortresses? I found it most helpful with a mage head, though a couple people (playing mage/priest builds) prefer the fighter head for its Fatality skill.
I got to level 26 with the first demon I killed in the first fortified section of Stone's flying fortress. I am playing a ranger, though, so it is easier (most of the time) to take out opponents a few at a time, compared to playing a pure warrior.