Warhammer 40,000 - Sisters of Battle / Adepta Sororitas
The Adepta Sororitas, or Sisters of Battle as they're commonly known, are an all-female branch of the Imperium's troops.
They specialise in hunting down the witches and the heretics wherever they may be found, and use a variety of flame-based weapons to cleanse the impure in the Emperor's name.
Clad in power armour like the Space Marines, they're amongst the most heavily armoured troops in Warhammer 40k, and their unshakeable faith in the God-Emperor allows them to perform miracles on the battlefield.
After many, many years of only being available in metal, the Sisters of Battle are now a glorious fully plastic army, with some stunning kits such as the Triumph of Saint Katherine, or the Exorcist tank.