Ohh getting to the lovis tower. That aint battle tower. Best tactic to use is to pull the mob out 1 by 1 and take them down, as your level will usually be lower compare to the mob in the area. As for the troll, I kill him at lvl6 even though its lvl 11. You can always use terrain to your benefits. Eg, getting to higher ground where the troll cant touch you and shoot it to death. It will take few minutes to kill it though
