The first keep first refused. I English is not good. It's not at all bad or that.
So, this sentence you are making by throwing 100% round to Google translation.
And I think it is a hard to read, you want to please forgive me.
If you would like to have a list of "bonus ability", it's the best of the good way is to check the script.
there is a list on the 549 line of the "script\☆スキル\アイテムウィンドウ'（防具など）.dat"file.
This is slightly also include "spoilers" specific elements. But, very easy to understand because the information is organized.
I wonder if this a good? It is not sorry if was looking for another answer.
At that time, the answer or I felt that if say so:D