Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)

Skull of the Unicorn Lord
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Talisman

Atop his scalp Ghorros wears the broken skull of Arsil, the Prince of Unicorns, who had an unfortunate encounter with Ghorros in a moonlit glade many centuries ago. It still harbours some of the protective magic of its former owner.

The Skull gives Ghorros Magic Resistance (2). However, such is their desire to avenge the Unicorn Lord that all units in Warhammer: Wood Elves have the Hatred special rule against Ghorros and his unit.