Source: Warhammer Armies Project: Unofficial 9th Edition

Blood Rage
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A fully enraged Norseman is a terrifying sight, howling like a wild animal, going mad, and cutting down everyone they meet indiscriminately.

Whenever a model with this special rule makes a successful charge (including Counter-Charge, Pursuit and Overrun), they are subject to Frenzy in the following first round of close combat.