Geyser spell

[BB Shockwave]

It's totally random, as in all KB games.

Use the save game extractor to get a CSV file of your save, open it in Excel and search for Geyser. If you don't find it... tough luck, but you could cheat and give it to yourself with -dev command, or hope it appears in a random chest in some battle.

I had a game in my first KB-TL walkthrough where my paladin foolishly used up his initial resurrection scroll, and... I never found another - there was none in the game up until much-much-later.