I'm an Oblivion kid, and as a proper edgy 12 year old, Umbra was my go-to weapon. This left me kinda bummed when they chose to bring it back as a two-hander (Morrowind fans please don't hit me), so I fixed it. I made it a one handed sword and made the blade slightly shorter and thinner, with a collision mesh to match. It should still be slightly longer than the average vanilla sword and the hilt is still the original size because I wanted to keep it feeling like a longsword, but if you have LeanWolf's Better-Shaped Weapons it should feel right at home.
It matches Miraak's Sword in terms of damage but weighs as much as a Daedric Sword, this should let it at least hold a candle to non-exploited custom enchanted weapons.
Slightly reduced the cost of the enchantment. It's not that you ever run out with the soul trap enchantment and all, but refilling it every couple of enemies got pretty tedious. Slightly reduced the duration of the Soul Trap.
I made sure the collision box fit pretty well and that it worked correctly on weapon racks and displays.
Obviously, it requires Umbra from the Creation Club.