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By Anonymous
Be wary of the Stalagmites version of this - seems to persist after combat and cannot be removed with the 'dismiss spell' ability (I stacked a few on top of mobs then managed to kill a character while trying to loot lol). Resting probably removes the spiked stones effect it but you can't rest in all areas otherwise I guess you need to wait out the 1 min per caster level duration.