Grom the Paunch of Misty Mountain led the Waaagh! that ravaged much of Yvresse, wiping out almost all of Eltharion's family and leaving his ancestral lands burned and defiled. Few feel a hate as intense as the utter loathing Eltharion reserves for Grom.
Source: Warhammer Fantasy: 7th Edition
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Such is Eltharion's hatred of the Goblin Warlord Grom that, in addition to Hating him (as per the main rule book), Eltharion receives +1 To Hit and +1 Strength when rolling to attack Grom in close combat.