Paralyzing Earth not for enchanter/necromancer?

[Halladar]

Not sure. But I seem to remember that sometimes you had to research a spell even if it was shared by multiple classes. I'm pretty sure that necros had to research identify even if they could buy a copy from the wizard spell vendor say.

It just wouldn't work unless it was researched.

I think Invis to Undead for wizards was the same. They couldn't stroll to the cleric guild and buy the scroll and mem it. Of course I don't think wizards got that spell till later.