While they are within 18" of Magnus the Red, Daemon Princes and Exalted Sorcerers from Rehati War Sect harness Warp Charge points on a 3+ when attempting to manifest psychic powers, and they have line of sight to every unit on the battlefield when determining the targets of their psychic powers.
If this formation contains the maximum number of units, then units from the Formation can re-roll any falied saving throw of 1.
