with mountain trolls, when halberds is at 3, use a huge row of halberdiers to smash an enemy. get enough so the enemy wont get by for ages, and then once you've got a charge, wait for a giant troll (let a few enemies through if you have to) and then charge! watch out for flailers and whirlers though!
To get your level up and get things like rocket launcher, trap yourself using barrels, then set off a chain reaction and kill the undead hordes waiting for you! All I have to say is: Wicked.
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