The star was given to Ungorr by the Dark Gods as a sign of belonging to them. The Star allows the Gods to always spot Ungorr even in the heart of the fighting and to watch over him (or to just watch him).
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Talisman
Ungorr may re-roll one failed To Hit, To Wound, Armour or Ward Save roll in each phase.