Why is Umbra’s damage 10 instead of 28

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I just reached level 20 as a sneaky destruction dark Elf and immediately decided to head to Clavicus Vile's shrine to obtain Umbra. From several sources I gather that Umbra's base damage is supposed to be 28, yet after getting the sword it only shows an attack damage of a measly 10 instead of the expected 28. This effectively makes it less than half as powerful as my other blade.

What could be causing this and what, if anything, can be done to resolve this?

Best Answer

This is because your one handed skill is low.

from uesp:

This modified value is the amount of damage you will see listed for a given weapon in your inventory.

So yes the base damage is 28 but due to your skill you will only do 10 damage.