Where to find these spells?

[johndoe3344]

I think it could be useful for others to share where they found the key spells that everyone keeps discussing.

For instance, geyser, fire rain, demon gate, sacrifice, target, etc.

I'll start -- I first found Demon Gate in the elven lands... I forgot the specific NPC though.

I haven't really come across the others yet -- could others share where to get them?