Cannot figure out how to learn the spell from Book of Knock-Knock. I waited until my Mage is 5th level, i read the book and it disappears without showing up. What am i doing wrong?

Never mind. Post in other forum figured it out. You just had to use the spellbook from the individual review screen.

One thing that's worth mentioning:

Using a spellbook to learn a spell in Wizardry 6 or 7 does *not* give you the spell points needed to cast the spell. Furthermore, unless you already have some SP in a realm, you won't get any by leveling up.

Therefore, only use a spellbook if you have already learned another spell in the realm (and therefore have some SP in that realm already).

Yes, but if you do that, you need to be careful; if there is no other spell you can learn in that realm, you won't be able to get spellpoints in that realm. Freeing up inventory space is literally the only reason to do this.

In Wizardry 6, for example, if you use a Book of Silence on a Psionic or Monk, and you don't change the character's class, the character will *never* be able to cast that spell (that's the only Air realm spell in the Psionic spellbook). There are other cases where there might be other spells learnable from that realm, but not until higher levels, so you might be stuck with an unusable spell for quite a while.