All Character classes have different Evilities to use in the game. Every character starts with one Evility granted to them at first level, This evility is determined by their character class and cannot be removed unless they have reincarnated into a new class. A Character can purchase more Evilities with mana, but can only ever have 2 equipped at a time Unless leveling up as a monster class in which you can utilize 3. When Utilizing the magichange monster combat maneuver, you also gain access to the starting evility of the creature you have Magichanged with.
The price listed here, is how much mana one must pay to be able to take the evility. It is possible to purchase an evility that does not appear on your list, however you have to pass a bill through the dark senate to be able to access it, furthermore, you have to pay 3X the mana price listed. Equipping a new evility for an old one is a standard action.
Evilities can only be taken once, and though you can switch them around and unequip them, you can never gain or equip the same evility as one you're already equipped with.
Basic Evilties General Evilities that any class or creature can access. They always cost the base price as if they were a class evility.
Class Evilties These are evilities based on Character class. They can be purchased at normal price for any creature belonging to the class and possessing the proper prerequisites. Otherwise they can be purchased by paying 3X the normal amount. However the prerequisite still needs to be met.
Level Dependant Evilities These Evilities are based on your overall Character level. They can only be purchased and equipped if you meet the prerequisites listed.
Prestige Class Evilties Some prestige classes have their own group of evilities that can be accessed. They too can be purchased without proper class requirements for 3X the normal amount.
Monster Class Evilties These are evilities based on Monster Character class. They can be purchased at normal price for any creature belonging to the class and possessing the proper prerequisites. Otherwise they can be purchased by paying 3X the normal amount. However the prerequisite still needs to be met.
Unique Evilties These are evilities based on specific characters from the Disgaea universe. Creatures who add these to their list pay normal price, Otherwise they actually cost 4X what is listed.