Just on the outskirts of Riverwood, there lies a small burial. with it a chest that contains the armor of 2 vampire knights. 1 preferred heavy armor while the other loved the freedom of light armor. in it is the tools of an assassin and the cleaver of brute strength. Every slash steals the life-force (Health, Magic, Stamina, and Soul) from its victims and replenishes the wielder. while wearing the armor, you can call on the shadows to cloak you in silence (only active while sneaking).

in the chest you will find:

Heavy armor set:
While noncombat, its just a slightly better set of Heavy Daedric Armor but when entering combat you automatically call to the shadows and increase in strength with 2hnded weapons by a percentage. The higher your skill, the more of a difference it will make exponentially.

Light armor set
While running around normal its just a simple Piece of light armor but when you go into sneak mode, you call to the shadows and gain a increase in sneak ability based on a percentage. The higher your skill, the more of a difference it will make exponentially.

1 2hnd Sword
2 1hnd Sword
2 Daggers
1 Bow

Recommended:

http://www.nexusmods.com/skyrim/mods/3395/? use this re-texture for the daedric armor and use the evil version