The official name of the shield is, "Mage Shield of Flames." You can get it either through the command console or by forging (in the STUDDED category).
How it works: Equipped it will boost your magic resistance by 25%. Blocking will double the rate of magicka regeneration. And a power bash (the related perk must be unlocked to work) will unleash a temporary flame cloak spell (the duration is only a couple seconds--I couldn't get it to work beyond that).
For a mage willing to sacrifice dual casting, even temporarily, this could be used when magicka is low and enemies are all around. The mage can block and recharge magicka, and use the power bash to deal with especially feisty creepies. =P
~ Credits & Thanks ~
. Mr Dave for his Texture Resource (http://skyrim.nexusmods.com/mods/2324)