(2 items) Adds 657 Weapon Critical
(3 items) Adds 129 Weapon Damage
(4 items) Adds 129 Stamina Recovery
(5 items) Adds 258 Weapon Damage, When you kill an enemy, you fill an empty Soul Gem and heal for 6202 Health.
The heal can occur once every 10 seconds and scales off the higher of your Maximum Magicka or Stamina.
The Oblivion's Edge set is part of the base game. It drops in Vaults of Madness in Coldharbour. Each set item is bound on pickup. You can acquire medium armor, weapons and jewelry of this set in the Breton motif style.