Cannot join (or be joined by) models without this special rule. Automatically pass Fear, Pinning, and Morale tests. When a unit with the Daemonic Instability special rule loses an assault, it takes a Daemonic Instability test at the Check Morale step of the Fight sub-phase. This uses the following procedure: 1) Take a Leadership test. if the dice roll is a double 1 or double 6, the Daemon's presence fluctuates: Double 1 - Reality Blinks: All Wounds suffered by the unit this phase are restored. Any models from this unit killed this phase return, in coherency, at least 1" from enemy models. If the returning modell's unit is locked in combat, the model Piles In. Double 6 - Banished!: Remove the entire unit from play as casualties. If locked in combat, the enemy consolidates. 2) Now, if a double 1 or double 6 wasn't rolled, compare the roll to the Daemon's Leadership, including modifiers. For each point they fail by, the unit sufffers an additional Wound, with no saves of any kind.
Deep Strike Mishap Table: D6 Roll 1: Terrible Accident! - The entire unit is destroyed! 2-3: Misplaced - Your opponent may deploy the unit anywhere on the table (excluding impassable terrain, but including difficult terrain, which of course counts as dangerous for Deep Striking units), in a valid Deep Strike formation, without rolling for scatter. Units embarked on a misplaced Transport can disembark during their Movement phase as normal. 4-6: Delayed - The unit is placed in Ongoing Reserves.
During deployment, players can declare that any unit that contains at least one model with this special rule is attempting to Outflank the enemy. This means they are making a wide sweeping move to get behind enemy lines or come at the foe from an unexpected direction. When an Outflanking unit arrives from Reserves, but not Ongoing Reserve, the controlling player rolls a D6: on a 1-2, the unit comes in from the table edge to the left of their controlling player's own table edge; on a 3-4, they come on from the right; on a 5-6, the player can choose left or right. Models move onto the table as described for other Reserves. If such a unit deploys inside a Dedicated Transport, they may Outflank along with their Transport.
If a unit contains at least one model with this special rule, and that unit arrives on a random table edge (due to Outflank, or other special rules), then you can re-roll to see which table edge they arrive from.