Sisters Repentia are fanatical self-mutilating warriors of the Sisters of Battle. Having failed or falled short of the Adepta Sororitas strict religious codes in the past, Repentia Sisters seek to earn the Emperor's grace once more by self-flagellation and find a glorious death in the heat of battle. Though ultimately outcasts, they are none the less revered by their fellow Sisters, who see them as pilgrims seeking the absolution of death and ultimate sacrifice in the name of the Emperor.
The Sisters Repentia
Confession and prayer are as much a part of a Battle Sister's existence as bolter drills and military discipline. Those who fall short of the Sisterhood's rigorous codes are subject to many punishments, but in the more serious of cases they may be exiled from their Order. These warriors, known as Sisters Repentia, band together into groups that seek redemption in the fires of battle. They are led to war by a Mistress of Repentance, who judges each exiled Sister's deeds and occasionaly, at battle's end, may declare her sins atoned for. Those rare few who return to the fold are held in awe.
Those who seek forgiveness occupy a state of grace that many apisre to, yet few attain. Indeed, some Sisters willingly exile themselves, finding fault in the smallest transgression in order to join the Repentia. The fervour of the Repentia inevitably means that they martyr themselves fighting against hopeless odds, finding in death the absolution denied to them in life.
- Codex: Sisters of Battle (5th Edition)