A surge of uncontrolled magical energy released when a spell misfires, is disrupted, or exceeds safe limits.
Backlash may damage the caster, disrupt nearby enchantments, or trigger unintended veil effects. Concord field manuals classify backlash severity on a five-tier scale, from minor feedback to total rupture. Often associated with arcane strain, overdrawn relics, or unstable runecraft.