Anointed with gore by Butchers, hung with runic items captured from the Dwarfs, and draped with numerous other tribal trophies, a Rune Maw constantly emits a low growl. When the banner detects a magical attack, that rumble rises to a predatory roar and, glowing bright the banner emits a deafening belch that deflects the magic of the spell, causing it to hit elsewhere.
Source: Warhammer Armies Project: Unofficial 9th Edition
Rune MawURL Copied!
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Magic Standard25 points
When any enemy spell targeting a unit with the Rune Maw is successfully cast, roll a D6. On a roll of 2+, the caster must choose a new target for the spell. If no other target is available (because no other target is in range or all eligible units have already been targeted, for example), then the spell is wasted but still counts as having been cast. Spells that do not specifically target the unit are not affected by the Rune Maw.