I have a couple spell grimoires, and some of the spells are obvious, or repeated from the original, but Teleport doesn't seem to do anything, and some of the others I have no idea what they do. What do the spells do?
Acid Rain creates a batch of droplets which cause harm to enemies, but not you.
Fireball creates a single fireball projectile.
Teleport does work as expected, but can have slightly different effects on different levels. It will either teleport you to the start, or at least back some way.
Erase Magic removes all magical (coloured) objects in play. This includes the sea snake's bubbles, and your own magic.
Thorn Shield creates a shield of thorns around you which damage enemies.
Obsidian Wall creates a tall wall in front of you that takes time to break through. Useful in combination with health potions.
Black Demons creates a wave of black demons that fly left to right across the screen, damaging you as well as all mobs.
Black Hole creates a black hole that inflicts massive damage to mobs that come into contact with it.