The Hellcannon constantly strives to break free of its bonds.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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At the beginning of your turn, if the Hellcannon is not in combat, take a Leadership test. If the test is failed, the Hellcannon is then subject to the Random Movement (3D6) special rule until the beginning of the next turn, and must move towards the nearest enemy unit. If the Hellcannon would get destroyed as a result of it being Unstable, treat this as rolling a 1 on the Doomfire Misfire Chart.