Warlord

If Lord Commander Eidolon is the Army's Warlord, then at the beginning of the battle, once all of the opposing player's models have been deployed, but before the first turn has begun, Lord Commander Eidolon's controlling player must select one enemy HQ or Primarch choice as Lord Commander Eidolon's "Rival". Lord Commander Eidolon and any unit he has joined gain a bonus of +1 to all To Hit rolls made against the "Rival" unit - and if the "Rival" unit is part of any enemy Shooting Attack or Combat that results in a friendly unit being removed entirely as casualties or Falling Back, then Lord Commander Eidolon and any unit he has joined also gains a bonus of +1 to all To Wound rolls made against the "Rival" unit for the remainder of the battle after that Shooting Attack or Combat has been fully resolved. In addition Lord Commander Eidolon and any unit he has joined may only declare Reactions against the Rival unit, but the first such Reaction each turn is free and does not reduce the Player's Reaction Allotment for that Phase.