Often an enemy's misdeeds are so great that a Dwarf will have this rune put upon his weapon and will not rest until his foe pays for his wrongs with blood. Only when his foe is slain will the rune grow dim.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Grudge RuneURL Copied!
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Magic Weapon20 points
For each Grudge Rune in your army, nominate one enemy character or monster at the beginning of the game. The wielder of a weapon engraved with a Grudge Rune gains +1 To Hit and can re-roll failed To Wound rolls in close combat when attacking the nominated model. Multiples of this rune have no further effect.