[Lews Therin]

I just looted a cloud kill scroll beneath Gullykin, and was wondering if my mage with int 18 will get to a high enough level to caste this spell from my book? It's a level 5 spell, so should I try to learn it or use it from the scroll?

Thanks in advance for any advice.

PS. I'm trying to get through BG1 without reading any spoilers. When I played BG2 the first time, I ruined it for myself by being to curious on these message boards.