I had memorized Summon Armoured Undead Decapitator. Then I respec'd. Now I've attempted around 80 times to craft a scroll of it with 3, 4, and 5 crafting. No luck. Same spells over and over and over, which leads me to believe this spell isn't craftable at all. Because I used my found skillbook (or scroll I turned into a skillbook, can't remember), am I doomed to never cast this spell again? Merchants in Cyseal and Silverglen seem to always have the same spells.

I'm level 15... Is there another merchant I currently have access to that I can check that I just haven't remembered?