[@Rondo of Blood] In this setting, Nth Metal is merely a special alloy with anti-magical properties that the Thanagarian race discovered how to make after they were nearly conquered by a race magic-using aliens. It doesn't make you fly, nor does it reincarnate you repeatedly, or any of that bizarre insanity. :P

It can harm any magical-based entity, provided it is forged into a weapon. Mere contact with it does not cause harm, even to such beings, nor does it emit any kind of field that aversely affects them.

It does, however, have the ability to negate any spells it comes into contact with. So if a Mage tries to make a portal to absorb your attack, an Nth Metal weapon will tear straight through it.