Talk:Sorcery (Dark Souls II)/@comment-191.112.122.194-20170318180126/@comment-4511886-20170318183728

Yes. You can attune all duplicates you have of a spell, assuming you have slots for it, and each copy will add casts equal to the spell's number of casts. For example, two spells with 15 casts will get you 30 casts, and three spells will give you 45 casts.

This also applies to the other three spell types.