These will be in descending order from "stronger" to "weaker". (these are opinions though, so the order is relative) Slayers will be at the bottom. (MR = Mana Regen, LMC = Lower Mana Cost, LRC = Lower Regent Cost, MI = Mana Increase, SDI = Spell Damage Increase, FC = Faster Casting, FCR = Faster Cast Recovery) [Spells added on request]
"Major": Free
MR 7, LRC 11%, SDI 11%
LMC 10%, Int 6, MI 6
FCR 2, FC 1, SDI 11%
LMC 10%, FCR 1, Int 7
MR 3, LRC 15%, FCR 3
MR 14, SDI 11%, Med +12
MR 8, LRC 4%, Int 7
LRC 3%, Int 4, SDI 8%
Int 8, SDI 8%, Eval Int +9
LRC 10%, FCR 2, Int 8
LMC 13%, MR 15, Mag Res +10
LMC 1%, Int 7, SDI 12%
FCR 1, FC 1, Int 8
"Basic": Free
LMC 8%, MR 2, FC 1
LRC 12%, SDI 11%, Med +3
FCR 1, SDI 12%, Eval Int +5
FCR 1, SDI 12%, Mage +5
LMC 4%, LRC 7%, MI 6
LRC 14%, MI 1, SDI 7%
Eval Int +11, LRC 12%, SDI 9%
MR 13, SDI 9%, Mage +8
MR 9, Int 4, Mage +11
Int 8, LRC 1%, Mage +11
LMC 3%, Int 8, MI 2
MR 9, LRC 12%, Med +15
MR 11, LRC 4%, FCR 1
Med +12, MR 5, SDI 10%
FC 1, SDI 12%, Med +3
LRC 6%, MI 6, MR 7
"Weak": Free
LMC 9%, MR 6, Mage +9
LRC 4%, FCR 3, Mage +7
MR 5, LRC 13%, FC 1
FCR 3, FC 1, Med +5
Air Elemental Slayer, Mage +15, Med +10
Med +15, LMC 8%, MI 8
Eval Int +12, Mag Res +6, MI 6
Med +8, Mag Res +11, Int 7
Med +5, MI 8, SDI 3%
"Slayer": Normal = 5k. Special = 15k
Snow Elemental, MR 10, FC 1
Orc, MR 8, LRC 11%
Balron Damnation, MR 3, LRC 2%
Dragon, LMC 10%, Int 1
Ogre, Mag Res +5, LMC 5%
Gargoyle, Med +12, Int 6
Scorpion, Mage +6, LRC 11%
Blood Elemental, Mag Res +8, LMC 10%
Fire Elemental, LRC 10%, SDI 10%
Terathan, Mag Res +7, LMC 11%
Dragon, LMC 5%, FC 1
Balron Damnation, Mage +4, MR 1
Water Elemental, Mage +2, SDI 5%
Demon, Med +7, SDI 12%
Ophidian, Mag Res +14, FC 1
Demon, Med +8, FC 1
Riain/Tempest/Onomaris
To reach the house with the vendor to get these while I'm not there, just take the gate to "Haven" and follow the coast west (left). The house is in disarray, but you can get to the chests/vendor easily enough.
A chest of free books too? Nice 8)