2 items: Adds 12-1096 Maximum Magicka
3 items: Adds 1-129 Spell Damage
4 items: Adds 14-1206 Maximum Health
5 items: Your fully-charged Heavy Attacks deal an additional 8% of their Max Health as Oblivion Damage. This can deal a maximum of 93-8000 Oblivion Damage.
The set consists of light armor and jewelry in all slots, as well as weapons and shields of all types.