Spellbook ability.....

i know many threads have been posted on this subject, but i just can't find the damn ability :)
what's it's name ?
where it is ?
i've learned how to use it thru reading most of those threads meantioned above, so i just need directions on how to find it :)
and some tricks and tips :)

Have you tried under Item abilities?

WorldEdit's object editor DOES have a search function, btw.