So in WoW there is a warlock spec called demonology, you would cast a simple shadow bolt 3 times to get 3 soul shards (resources) and you would cast "hand of gul'dan" its a flaming small meteor from the sky that explodes and does decent damage to the primary target and minor damage to those around the primary target. After the mini magic explosion 3 wild imps are spawned near you from said meteor. They begin shooting small fire balls for a specific time before disappearing. How ever you can use a spell called IMPlosion that orders your imps to charge at the enemy and combusting upon their foes sacrificing them for aoe damage. There are other spells to summon demons that fade within a short time. This is the inspiration i get with summoning minions to do your bidding.
Sage was highly influenced by the world of warcraft priest specialization: Discipline that would give allies a buff called atonement and any damage upon enemies would heal allies with atonement. Penance is the at one spell that shoots a big orb of heal towards an ally, bubble based cds are disciplines shields and so on.
Hunters have an ability called Stampede that just has a bunch of animals running through an enemy doing aoe damage, the animals themselves dont have any physical bodies to block you as its just a spell. And elemental disasters can be really anything.