One of the Part 2 updates (I think it was 2.20) overhauled a lot of weapons and skills. Some of these details were edited in to the NPCs at Ilias Temple, but the full descriptions are found in a book that's at the entrance to the Labyrinth of Chaos. In addition to that, hit rate bonuse have been omitted from descriptions to free up space in them. Here are the effects for reference, in case you don't have access to it.