Leveling Conjuration
Conjuration uses spells like bound sword, soul trap, conjure familiar, and raise zombie to be the necromancer you always wanted to be. You can pull weapons out of thin air, use creatures from oblivion to fight for you, and steal the souls of your opponents as they die—conjuration is super cool. But if you want to get to level 100 quickly, find a dead body and cast soul trap on it. Any dead body will do and you don’t have to have killed it yourself, but once you have the dead body in front of you, put soul trap in both hands and go to town. Very much the same way to level up your illusion, alternate casting soul trap on the dead body. Farengar also sells this spell at the beginning of the game, so if you want to level up your conjuration skill, the spell to use is soul trap.