Magic weaving, also known as weaving or spell weaving is a form of metamagic that can be applied to spells.
Weaving causes the caster to be able to cast spells without the necessary requirements. It also can be used to cast spells with additional effects and power.
This usually causes the spell to have unpredictable side effects. Most of the time leading to devastating consequences.
It is the reason casters are feared in Lorean. Peasents run when they see magic, and the law arrests and burns witches.