Endless spells are autonomous, predatory enchantments that roam the battlefields of the Mortal Realms with a will of their own, unleashed in vast numbers after the Necroquake supercharged the magic of the age. Before that cataclysm, a spell lasted only as long as its caster maintained it; afterward, the boundary between a conjuration and a living thing grew perilously thin.
An endless spell takes shape when a wizard channels enough raw magic to give a working independent life. Once summoned, it persists long after the incantation ends, drifting or hunting across the field as a spectral predator, a rolling wall of flame, a swarm of gnashing jaws, or a devouring vortex. Some can be steered by a nearby mage; others answer to no one, striking friend and foe alike with equal, mindless hunger.
Because they are so unpredictable, endless spells have transformed how the peoples of the realms wage war and practise sorcery. Skilled mages learn not only to summon them but to unbind an enemy's conjurations, wrestling hostile spells apart before they can wreak havoc. The most powerful are practically monsters in their own right, magical beasts born of pure sorcery, and their proliferation is a lasting scar of the Necroquake, a sign that in this age even magic itself has slipped its leash and learned to hunt.