Depending on how you do the quest with the drunken Seekers in the Black Boar inn, they can get sent on a punitive mission to kill a troll.
At level 7 I was able to use a bow to take out the level 8 skeletons at the main (locked) gate of the tower (switching to melee when they got close), with several strategic retreats to heal behind the large tree down hill. As long as you get one or two of them each attack, the next approach will be easier. After that I continued south east to clear the level 6/7 goblins, and the first couple level 9 bandits.
The bandits were too tough in large groups, so I went west of the place you meet the dragon knight, and up the northern path through the mountains (and level 6/7 goblins). Farther west I cleared partly towards the passage to Maxos temple (at level 8 or 9 I could take out the level 11 black ring members one or two at a time), then decided to leave that area and clear out the derelict tunnel (the two goblin entrances already cleared above ground). After that I finished off the skeletons around Lovis's tower. I kept exploring, though, and did a fair bit before actually entering the tower.
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