Atop the staff is a mystical orrery with which Tetto'eko can alter the trajectory of passing comets.
Source: Warhammer Fantasy: 7th Edition
The Stellar StaffURL Copied!
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Arcane Item
If Tetto'eko successfully casts the spell Comet of Casandora you may re-roll the dice at the start of each player' turn to see if the comet arrives.