Infernal Armor

The Infernal Armour is surely a fearsome sight. Seeing someone wearing an armour made a flames is sure to carry terror into heart of the enemy.

However, this actually is not the reason for this spell. Instead, it is used to protect the caster from fire damage, may it be from natural fires, magical fire attacks or even from lava. However, the bad side to this spell is, that it constantly feeds of the mage's mana until dismissed. Should it run out while walking through lava...