Minor Grimoire Imprint. What am I missing? Seems useless

[Telmorial]

So I have a choice to learn 'Minor Grimoire Imprint', a level 4 spell which allows me to take a random level 3 spell from an enemy caster. Now, I think that means the level 3 spell will be cast-able for 'free' (IE will not use one of my per rest level 3 spells) but what's the point when I just lose a level 4 (by casting the Minor Grimoire Imprint) per rest?

[Mungri]

Good point there, its a useless spell. And there needs to be an enemy wizard for it to work.

 

Better to just cast a firewall instead.

Edited April 7, 2015 by Mungri

[PBJam]

yeah I think it is kinda useless too, though always fun to "steal" a spell from an enemy

Edited April 7, 2015 by PBJam

[Dead Optimist]

So I have a choice to learn 'Minor Grimoire Imprint', a level 4 spell which allows me to take a random level 3 spell from an enemy caster. Now, I think that means the level 3 spell will be cast-able for 'free' (IE will not use one of my per rest level 3 spells) but what's the point when I just lose a level 4 (by casting the Minor Grimoire Imprint) per rest?

I have no idea, but maybe when it "steals" the spell the enemy wizard loses access to it? So it acts like a spell block + giving you another option. Again, I do not know if this is fact or not.