Banner of the Hidden Dead

Nominate one of your units of Infantry, Cavalry, Monstrous Cavalry or Chariots with the Undead rule that has yet to deploy, whose total points value is no greater than 200 points. That unit gains becomes Entombed Beneath the Sands. When this unit arrives on the battlefield you must place its 'Entombed Beneath the Sands' marker within 12" of the Banner of the Hidden Dead. If the bearer of this banner is destroyed before the hidden unit emerges, the entire hidden unit is destroyed and removed as casualties.

In addition, every unit that is Entombed Beneath the Sands and attempts to emerge whilst its marker is within 12" of the Banner of the Hidden Dead (including your nominated hidden unit) can re-roll the scatter and artillery dice when emerging. Note that you must either re-roll both, or neither of the dice.