I've got a fully upgraded Mantle of Wizardry, and the way it works seems to be if you're a mage (I'm not) then it's morale stays at normal. But if not, it slowly goes down over time. Once it reaches 0 you stop gaining bonuses.
With this item, there are actually 2 ways to increase it's morale. If you let it get all the way to 0 you can Suppress (fight it) and restore it to Normal (50). Or, you can Use it to 'feed' it 6 magic crystals, which upps it morale by 25% or so.
I've got to say, this is a pretty well thought out way to handle the items. Not only does it make sense but it requires you to think about the item as opposed to just taking it for granted like in most games. Very nicely done.
BTW - at full upgrade it's +20 mana & 30% Magic Resistance. Hope I can find a similar item for Paladins!
-Munch