Actually, im building some lore, and my final release will have FOUR new schools of Magic:
Sorcerers use Druid magic(I know its a weird name - go with it) and have 30 spells total that can exist.
They can only summon using a dead body because, in nature magic, there must be balance - to create a life, there must be a death.
They are not immortal, and must eat, sleep, etc.
Wizards use Arcane magic, and gain powers from either Primordials(new megabeast) or Creation gods. They are immortal, but
must eat, sleep, etc. They can summon a megabeast to aid them - a pheonix, or a hydra, or something else, depends on what type - but
only one every 500 years. So an ancient wizard is, in fact, more powerful. THEY need a dead body to summon as it acts as the host, and the
spell just catalyses a transformation. Their megabeast(s) is a manifestation of raw arcane energy, rather than a "true", independant megabeast(has exact same stats tho)
Clerics/High Priests use healing magic, and have healing and empowering spells - they can fully heal you/an ally, but ony rarely(once a day), and they can boost Strength or Agility or Endurance temporarily(more often) They get powers from gods of light, good, law, etc.
Warlocks are dark wizards - when you defile a temple, there is a chance that, rather than being cursed by the gods, a demon will take note, and reward you with great strength and a new magical ability - the ultimate mockey of gods. Warlock magic is spread through blood, not spellbooks, and consists of magics like Harm and Blight, as well as a boost to physical stats, immortality, and no need to sleep or eat. Unlike vampires(the template), they do not need blood to live.
A few spells, like Harm, are taken from Dark Ages or Masterwork, as are all new megabeasts minus the primordial, which is an original. All druid spells and arcane spells are, however original, and were more time-consuming than difficult to make. The cleric and warlock are not done, but the warlock will be original with both new AND ripped-off spell variants, wheras most Cleric spells will, in fact, be original. And yes, the goal is to make each spell individually learned - becoming a wizard does not give you the Hydra, Manticore AND pheonix pell, if you want those, all three must appear, and you must journey seperately for each one. This means you can have a custom blend of spells, such as mixing Druid and Warlock magic with Blight and Summon Rat to be a sort of "filth-mage", or getting First Rune of Healing to help out your Wizard's Wyvern when it is injured.