Aetaos'rau'keres

Instead of moving in their Movement phase, any CHAOS CHARACTER can, at the end of their Movement phase, attempt to summon a DAEMON unit with this ability by performing a Daemonic Ritual (the character cannot do so if they arrived as reinforcements this turn, or if they themselves have been summoned to the battlefield this turn). 

If they do so, first choose one of the four Chaos Gods - KHORNE, TZEENTCH, NURGLE, or SLAANESH. A CHARACTER who owes allegiance to one of the Dark Gods can attempt to summon the units of their patron - for example, a KHORNE CHARACTER could only attempt to summon KHORNE DAEMONS. 

Roll up to 3 dice - this is your summoning roll. You can summon one new unit with the Daemonic Ritual ability to the battlefield that has a Power Rating equal to or less than the total result so long as it has the same Chaos God keyword you chose at the start (in the case of units that have the choice of allegiance, such as Furies, the unit when summoned will have this keyword.) This unit is treated as reinforcements for your army and can be placed anywhere on the battlefield that is entirely within 12" of the character and more than 9" from any enemy model. If the total rolled is insufficient to summon any unit, the ritual fails and no new unit is summoned.

If your summoning roll included any doubles, your character then suffers a mortal wound. If it contained any triples, it instead suffers D3 mortal wounds.

If your Army contains a unit with the Arch-daemonic Ritual rule, they may instead of being deployed normally be summoned like other Daemons to the battlefield, although with greater risk to the summoner as befits their power and perilous nature. The usual rules for Daemonic Rituals apply with the following alterations:

When attempting an Arch-daemonic Ritual, the summoning player must first declare which unit they are attempting to summon by name beforehand, and only characters with the same Mark of Chaos as the unit you wish to summon can be userd to summon the unit.

When attempting to summon a unit using an Arch-daemonic Ritual, roll up to nine dice - this is your summoning roll. You can summon one new unit with the Arch-daemonic Ritual ability to the battlefield that has a Power Rating equal to or less than the total result so long as it has the same Chaos God keyword as the summoning character. This unit is treated as reinforcements for your army and can be placed anywhere on the battlefield that is within 12" of the summoning character and is more than 9" from any enemy model. If the total rolled is insufficient to summon any unit, the ritual fails and no new unit is summoned. 

If yourArch-daemonic Ritual summoning roll included any doubles, your summoning character then suffers a mortal wound. If it contained any triples, then the summoning character is slain instead (note that the summoning can still be successful, even if the summoning character perishes in the attempt).