The Adepta Sororitas has its origins on the world of San Leor. An order known as the Daughters of the Emperor, an all-female cult dedicated to worship of the Emperor, had been discovered there by members of the Ecclesiarchy. Goge Vandire, the High Lord of the Administratum (and also Ecclesiarch of the Adeptus Ministorum), decided to pay a visit to San Leor and recruit the Daughters into his own private army. The Daughters, at first, refused to accept his authority. Vandire decided to show them that he was blessed by the Emperor - he instructed a soldier in his entourage to shoot him, which after a brief hesitation, he did. However, thanks to the protective field generated by the Rosarius of the Ecclesiarch (which no one but Vandire himself was aware of), Vandire was not harmed. The Daughters took this to be a sign, and swore allegiance to Vandire virtually on the spot. They became the Brides of the Emperor, and were Vandire's most loyal followers.
During the Siege of the Ecclesiarchal Palace, the Adeptus Custodes, the praetorians of the Emperor himself, tried to approach the Brides and convince them of Vandire's treachery. In a last ditch effort to convince them, the Custodes took Alicia Dominica, leader of the Brides, and her chosen bodyguards deep into the Imperial Palace where they stood before the Emperor himself. What happened there remains unknown - Dominica and her companions were sworn to secrecy - but it became clear that the Brides, who reverted to the title of Daughters of the Emperor, had been awakened to the evil that Vandire represented. Marching into his audience chamber, Dominica paused only to condemn Vandire for his crimes before she beheaded the power-crazed dictator. Reportedly, Vandire's final words were "I don't have time to die - I'm too busy!"
After this episode, the Decree Passive was proclaimed by newly appointed Ecclesiarch Sebastian Thor. Under the literal interpretation of the decree however, the Adepta Sororitas were not obligated to disband because the decree made no mention of "women under arms." Thor, recognizing the need for the Ecclesiarchy to have some kind of force and internal regulator, allowed them to remain, even if the spirit of the decree was rather blatantly disregarded.
When Thor first took over, there were only 4,000 Daughters of the Emperor, but this quickly expanded to over 10,000 after the Adepta Sororitas (Sisters of Battle) was founded. It was his successor, Alexis the XII, who divided the Sisters into two home worlds and four Orders Militant led by Alicia Dominica and three of her companions who wanted to lead their sisters into battle. The last two major Orders Militant were created two and a half Millennia later in honor of the last of Alicia Dominica's companions. Their Orders were later expanded to hold more than 15,000 Sisters, but their current standing places each Order with no more than 7,000 members.
Today, the Sisters of Battle are spread across the galaxy in their various conflicts. However, two locations (Terra and Ophelia VII) are held as more sacred than all others and are home to most of the Orders' convents. Ophelia VII is the Oldest Cardinal World and home of the Synod Ministra. As Terra is covered with administrative buildings, Ophelia VII is covered with Cathederals and places of worship. Beneath these buildings are vast prisons that hold heretics ready to confess and repent for their sins.
Sisters on Armageddon
A few of the Orders fought at the Third Armageddon War, but it was the Order of our Martyred Lady who largely represented the Sisters of Battle in the Armageddon sector. It was they who were the sole protectors of the Ecclesiarchy and the faithful of Hive Tempestora during the Third Armageddon War. Their base of operations was the Sanctorum of St. Katherine in Hive Tempestora, which became the centre for Ecclesiarchal activities on Armageddon and thus, refuge of the faithful from invaders.
Hive Tempestora was assaulted during the Third Armageddon war by a surprise assault of Orks emerging from the Boiling Sea. The Sisters were the defence for Hive Tempestora, but the surprise and size of the Ork attack caught the Imperial forces unawares. This allowed the Orks to quickly steal control from the Sisters.
The Sisters were forced further into tunnels of the Hive with each attack by the Orks. When the Orks reached the heart of the Hive, the Imperial command structure began to break down as the hordes rapidly pushed on. Several units were dispatched to defend areas which had already been overrun and the few Hive militia they could rally proved to be ineffective against the Orks. They fought a losing battle until they were eventually forced against the great armoured doors of the Sanctorum.
Here, the Sisters could not retreat any further and it was their duty to defend their sanctuary with their lives. The Order rallied against the Orks and called for every member of the Ecclesiarchy to fight and die in defence of Armageddon's most holy site. It was a battle of attrition and with the sheer weight of numbers the Orks gradually overwhelmed the Sisters. It was a charge by Warboss Nargrim and his elite Nobz that caused the Sister's line to crumble. The lines of Sisters, broken and scattered, attempted to form up again but were readily cut down by the huge tide of Orks. After just hours since the initial invasion by the Orks, no human was left alive inside Hive Tempestora and corpses stained the sacred ground.
With the massive destruction at Tempestora, reminiscent of the Tyranid's destruction of the Ultramarines at Ultramar, the Order of Our Martyred Lady was devastated and left with less than three companies upon Armageddon. The loss of Tempestora's Sanctorum devastated the morale of the Sisterhood, and they fought to recover from such a dishonor. Though they lost greatly at the beginning of the campaign, their aid was essential in the final defense of the planet.
On the other side of Armageddon, the Order of the Argent Shroud, with its five companies under the leadership of Canoness Carmina, were used by General Kurov in the Fire Deserts during the war. They later joined with their fellow Sisters to retake the Holy Sanctorum and restore their lost honor
my 3rd book in progress
its the pages that are on there third draft so allmost none srry