Sacrifice by Dakota Banks
A demon’s enslaved executioner–a ravager of lives and souls–Maliha Crayne has been reborn, willing to sacrifice her immortality for a chance at freedom … and salvation. Now she has an opportunity to prevent the death of thousands to help balance the countless lives she has obliterated over the centuries. To do so, she must locate and destroy an evil cabal of madmen in possession of a weapon of unspeakable power–and survive the immortal assassins who are now after her blood. But it means reverting to the old ways and surrendering once more to the darkness.