When the spell contained in the Orb of Thunder is released the sky darkens and a pall of black thunder clouds covers the battlefield. The upper reaches of the sky are thrown in turmoil, and the clouds form a barrier to flying creatures. When the Orb's spell is cast the roiling layer of magical storm cloud makes it impossible for flying creatures to fly high into the air.
Source: Warhammer Armies Project: Unofficial 9th Edition
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Enchanted Item30 points
Bound Spell, Power Level 4. Remains in play. The Orb of Thunder contains a hex spell that effects all models with the Fly special rule. When cast, no models may use their Fly special rule and must move on the ground at their normal Movement rate.