Titanic skin

This spell turns the users skin into titanium. It also doubles the users strength, while in effect, to account for the added weight of the titanium. For consistency, the spell does not take spell slots. All physical damage is completely negated, and magic does a quarter of what it usually would. Other classes must learn the spell through roleplay, and watching the user of the spell, to try to understand how it works. Character learning the spell, must roll an intelligence check above ten, to successfully master the spell and use it on command, efficiently.