All weapons. Currently there are only two things with "true" bonus damage on crit: Red Hit Magatama and Ice Blitz Magatama (both are in "Other Magatama" on the Magatama main page and are not available to players). As you can see, neither has a probability - An easy way to tell it apart from the mistranslation.

Community content is available under CC-BY-SA unless otherwise noted.