
Conjurers deal with Oblivion, the undead and the trapping and binding of souls to their will through Soul Trap.
Effectively limiting how many summons you can send to their deaths, which should ideally incentivize the use of support magic on them. Now when a summon is killed, an empty variant of the soulgem used to summon them is returned, or soulgem fragments. Most spell pack mods include ways of enhancing/healing your summons, my main gripe with these is that they're not worth it due to the innate disposability of the summon, where they can be instantly recast, costing nothing but mana, which is ultimately a resource you should have plenty of outside of earlier levels.
It should encourage a more proactive/supportive playstyle. In attempting to fix this, the strongest summons need a filled soulgem, with each summon potentially risking the loss of the soul stored within, and possibly shattering the soulgem at worst, leaving nothing but fragments. The classic strategy of spamming dual Dremora Lords comes to mind, which is how I played my first run of Skyrim. Leading to conjuration players just picking whatever the strongest, most reliable summon is, and throwing it at the enemy in infinite numbers. Despite all the diverse summons you can get through mods, there isn't much reason to vary up what you're using unless an enemy has a resistance to the damage type of the elemental summon. I've got a couple reasons behind doing this: