Oblivion: Get OP Sword Before Leaving Sewers!
You might not realize this, but Umbra is an incredibly tough boss in the game Oblivion Remastered. She also wields the most powerful sword in the game. It wouldn’t be wise to confront her at the beginning of your adventure due to her strength. However, you won’t be battling her directly, which makes acquiring her sword less challenging than it would otherwise be.