Imaris
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Goblins aren't the best unit, but they're really good at setting traps (if they're trappers). Place a trap under the feet of a Paladin or a rider on a lizard, and there's a chance they won't make it, which can be very helpful. Otherwise, I almost don't use them, except maybe to finish off enemies. And you can never have too many goblins, especially if you have the War Cry skill.