Umbra is an ancient and enchanted
sword in the
Elder Scrolls universe. It appears in
Morrowind and
Oblivion, held by an
Orc and a
Bosmer respectively, each named Umbra after the legendary weapon they wield.
In Morrowind, Umbra is looking for a warrior worthy of his namesake sword - he asks you to kill him, if you think you can. In Oblivion, Umbra has retreated into an Ayleid ruin, presumably to avoid killing any more people. When you approach her, she tells you "Leave while you still can." You cannot start a conversation with her, but she will quietly confide in you if you stand nearby:
"Umbra... it is everything." "It hungers for souls."
The sword is an ebony longsword which casts Soul Trap for 120 seconds on strike. It is unusually fast for its class.