Phydra, the Ghost of a long dead Bosmeri Dawnguard, has come back from the dead as a ghost to fight as your side against the Vampire Menace!
Phydra can be found in the Cave in the east (?) side of the Dawnguard Fort, where the Training Dummies are.

Voiced using only Vanilla Skyrim dialogue
Fully Functional
Carries a powerful Crossbow for you to borrow

Requires:
Skyrim (Obviously)
Dawnguard (Again, Obvious)

Modify this as you wish, but give me credit. Do NOT post any modifications outside of the Nexus.

NOTE: This mod SHOULD work in SSE, let me know if it doesn't.

My Other Mods:
Briinah, The Mini-Dragon: http://www.nexusmods.com/skyrim/mods/78511/?
Marrik, The Ghost Thief: http://www.nexusmods.com/skyrim/mods/79733?
Lilitha, The Ghost Mage: http://www.nexusmods.com/skyrim/mods/79734/?