I want to make a master level Conjuring spell that includes the soul trapping effect as well as a damaging effect. I made a custom soul trapping effect and set the minimum skill level to 100. When I try to add the effect to my spell (the effect list is empty) it's not there (I named it with a _ at the start so it would be at the top). Can anyone help me understand why that is?

Make sure that the Casting Type and Delivery are the same for both the Spell and the MagicEffect.

Yeah, that fixed it. Thank you.