Many supernatural creatures are immune to the natural enviroment, and can be slammed through walls, thrown off cliffs, cast into the deep ocean, all with little more than results that inconvienance the foe. This is a staple of comics and movies. Fire is often the sole exception, being able to hurt almost anything, with the exception of ethereal type monsters, such as ghost.
However, few creatures in RM require magic to damage. Even the mightiest dragon can be killed by a mundane spear. In comics, Superman has only one weakness besides kryptonite; magic. Magic is assumed to be a universal energy that can affect just about anyone.
Sweeps will smash a skeleton and good, but are absolutely worthless against a Fog Beast or Demonic Protoplasm. Even creatures that could be hurt, such as Gorgonar Demons, are best not grappled because of their ability to immolate. Now, knocking such a fire spirit into a lake may result in damage, but these situations are best dealt with on a case by case situation.
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