In almost every game which asks me to choose a class, I'll pick the one which lets me summon something. This is because I am lazy, and I like watching something else do all the work for me. Valheim have classes, but there's now a mod which adds a necromancy skill with the ability to summon a group of skeletons. So that's me sorted, then.
Valheim already has its own sort of magic with the forsaken powers you get from each boss, but if you're more into to slinging fireballs around you may want to try out Skyheim. This mod adds runes that you can craft with loot from bosses and dungeons. Summon a light instead of carrying a torch. Scorch a forest full of Greylings with your fire. Oh, and teleport yourself back to your bed at will. It sounds pretty powerful, but chucking fire and ice around sure looks like a good time.
After a strong mining sesh in Valheim, I believe there's no greater agony than smelting all the ore I've gathered. Yes, it's satisfying, but I am a terribly impatient individual who demands my metal bars now, not later. That's why a mod which lets me overclock my smelters, kilns, and blast furnaces with Surtling Cores has me interested. Finally, I can speed up the process.