From epedia:

It is possible to give "mundane" (non-verby, non-gore, non-swappable) one-handed edged weapons (light, medium, or heavy) to a warrior. A common reason for doing this is to give the warrior a blessed weapon for hunting the undead.
Similar to necromancer pets, any precious weapons should not be given to a warrior. Item loss may occur due to the dropping of the weapon when the warrior despawns or is killed.
A bonded weapon cannot be held by a warrior.

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Amybecka