Up to 2 units of Miners may be taken as Core choices in an army led by Brok. In addition, when using the Ambushers special rule, these units may re-roll the dice each turn to see if they arrive on the battlefield.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Up to 2 units of Miners may be taken as Core choices in an army led by Brok. In addition, when using the Ambushers special rule, these units may re-roll the dice each turn to see if they arrive on the battlefield.