Summon Deadly Smog

This spell summons one creature known as a “deadly smog” from the Negative Material Plane. The caster can cause the creature to appear at any location within the specified spell range. The deadly smog then is trapped within the Prime Material Plane until it is killed, gated back by some other force, or forced back by powerful wizards. This spell drains the caster of one-half his total hit points; the spell cannot be cast again until rest sufficient to restore all hit points lost has been completed; potions and spells do not suffice in this case.