While some weapons, like longbows and staff slings, require both hands and
focus, some smaller weapons can be fired, although with less accuracy, even in
the archer's non-primary hand. This is challenging, and only masters can pull
off trick shots with their left hand.
1% and up: slingshots
21% and up: light crossbows
41% and up: slings
61% and up: medium crossbows
81% and up: heavy crossbows
101% and up: shortbows
Skill chance reduces the penalty, regardless of weapon type.
Regardless of skill%, you cannot fire an overwielded weapon offhand.