"[Mana Armour]" Simon narrowed when he saw the bluish green aura around his opponent that saved him from being utterly burned by his infernal magic.
'When someone breaches level 500, their mana will start to become more dense and solid and can be used to form a cloak of some sorts giving them increased defensive power' as this was not his first time facing an enemy who is able to use [Mana Armour] Simon wasn't fazed by seeing his enemy surviving an advanced tier attack head on.
However, the Mana Armour he knew off was much more powerful than this which shows that Morgress' Mana Armour wasn't complete. It could be because he had yet to breach level 500.
Whatever the case maybe, the Mana Armour ability of Morgress wasn't something that was impossible to deal with.