each vocation has 4 promos, and each promo unlocks additional spells. like so.
Promo level 0: 3 single target spells.
Promo level 1: 3 SIngle/small aoe/beam/wave
Promo level 2: 3 med Aoe/scoot abilitys
Promo level 3: 3 Buff spells
Promo level 4: 5 Ultimate ability Large aoe/voc buff/stylish effects\
Total of 17 spells
Wizard:
Promo level 0:
ice/energy/fire/earth shot (single target shot, like exori frigo)
ice/energy/fire/earth blast ( like 2-3 singles shots, maybe less dmg/cd)
ice/energy/fire/earth bleed (makes the enemy bleed with the elemental effects)
Promo level 1:
ice/energy/fire/earth beam (4-6 sqm wave arround the caster)
ice/energy/fire/earth infernal beam (same as normal beam but makes the enemy bleed with one of the elemental effects casted)
ice/energy/fire/earth tornado (single aoe target. Wizard charges his weapon with one of the elements and throw it to the enemy making it and surrounded enemys take damage)
Promo level 2:
ice/energy/fire/earth saviour (for a short time the wizard protect himself with one of the elements and the enemys who attack him takes DoT)
ice/energy/fire/earth rain (rain of elements which random hits the enemy)
ice/energy/fire/earth wall (wizard makes elemental wall that damage enemys who touch it)
Promo level 3:
ice/energy/fire/earth transformation (wizard transforms into a element to become stronger)
ice/energy/fire/earth sage (wizard increase one of his elements)
ice/energy/fire/earth enchantment (wizard adds dmg to his rod with a element (like fire sword for example with the fire damage)
Promo level 4:
elemental transformation (wizard mix all his elements to transform into a new creature which has the 4 elements in 1)
elemental explosion (elemental transformation required) (wizard concentrate to make a elemental explosion which destroys all)
elemental enchantment (same as ice/energy...)
elemental rain (randomly each elemental raise from the sky (like fire/ice/etc)
elemental destruction (wizard cancel his elemental transformation, and make a rain of elemental that bleed magic (like promo level 0). If the player doesnt cancel the transformation and it end by itself nothing will happend, but it it is canceled wizard will be exhausted for a bit time (depends of you)
This are the wizard spells that I think it can help you with ideas. I'll make the other vocs if you like the ideas. Hope it helped