The Scorpion Queen by Cate Corvin

When the Dawning begins, a new queen will be chosen by the scorpion god…
The day I was marked with the sign of Scorpio, I knew my freedom might be lost forever.
And as more priestesses appear with the God-mark of a potential queen, we’re ordained by Scorpio to endure three deadly trials and prove our worth.
Only one of us can win the crown, and some are willing to win at any cost. The knives are out and the competition to become the next queen is fierce, even at the cost of murder.
But the desert has chosen me. The sting of a scorpion can’t kill me.
With blades, venom, and my three temple guardians, I’ll make sure I’m the last one standing.