"One-handed governs your ability to use one-handed weapons, including DAGGERS, swords, maces, and war axes."
"The downside to using daggers is that they do not have a weapon specialization (they get a perk in the Sneak skill tree instead which works only with sneak attacks) and they do not benefit from Fortify One-handed effects, which can dramatically increase the damage output of one-handed weapons."
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