An Altar of Myrmidia has a Ward Save (4+). It allows all friendly units within 12" to roll 3D6 for all Psychology tests and discard the highest result. In addition, any Battle Prayers cast from it target all friendly units within 6" of the Altar.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
An Altar of Myrmidia has a Ward Save (4+). It allows all friendly units within 12" to roll 3D6 for all Psychology tests and discard the highest result. In addition, any Battle Prayers cast from it target all friendly units within 6" of the Altar.