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Drop your Caltrops on the Tanker's Mud Pots.
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Please, please, please DON'T do this. At least, not if I'm your tanker.
Mobs will run away from caltrops. When I'm running 'pots, I want everything to be as close to me as possible. When you drop caltrops on top of me, I lose my whole crowd.
A much better use of caltrops is to give yourself some insurance against anyone that peels off the herd and comes after you---toss them in front of you and those mobs will think twice about closing (or, at least, will be sitting ducks if they decide to do so).