User blog comment:KrystalLBX/Magic world custom attribute/@comment-11372432-20180624072716/@comment-11372432-20180625040238

So, a fire tome that needs a fire spell in the drop? That works.

Also, I’d recommend either making one spell able to be the buddy (there’s a reason only Lae is the buddy, same with Durendal) or make it so a spell is “enhanced” when it is the buddy. Basically, “Do X, then if this is your buddy, do X”, “Do X, but if this is your buddy, do (better than X) instead”, or “if this is your buddy, you don’t have to pay cost”.