Necro Spell buying guide?

[Canelek]

And don't forget to save those words up and spend points at trainer into Research every level starting at 16. Training research sucks, but those first few spells should be pretty easy as you acquire words. Some spells are available via both research and vendor, so if you have the words and get successful combines, it'll save you some cash for sure.

Level 20 spells are 10-12pp for example.