Any friendly War Beast, Monstrous Beast, Monstrous Cavalry or Monster (except Devas) within 6" of a Beastmaster may re-roll failed Leadership tests and are Stubborn.
Source: Warhammer Armies Project: Unofficial 9th Edition
Any friendly War Beast, Monstrous Beast, Monstrous Cavalry or Monster (except Devas) within 6" of a Beastmaster may re-roll failed Leadership tests and are Stubborn.