Source: Warhammer Fantasy: 8th Edition

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At the start of each friendly turn, a model riding a Manticore must take a Leadership test. If the test is failed, the Manticore and its rider are subject to Frenzy until the start of their next turn. Also, should a Manticore’s rider be slain, the Manticore does not take a Monster Reaction Test. Instead, it is automatically affected by the ‘Raaargh!’ Monster Reaction result.