FoolSilver by Meg Xuemei X

Two monsters want to own me.
The four princes standing between us are ready to burn the continent to ash to stop them.

A Fae who hasn’t wanted anyone since the world ended. A vampire who’d rather starve than drink from another throat. A shifter who claimed me in front of his army. A dragon whose own fire chose me when he begged it not to.
Wanting all four isn’t loyalty—it’s betrayal. I know exactly what that makes me. But I won’t let a single one of them go.
The White Witch tests her lab-grown horrors on us like we’re a field she planted to harvest. And the Collector—the Haven’s tyrant—keeps the Oracle’s severed head alive under glass, feeding on stolen visions. He’s decided I’ll be the centerpiece of his collection. To guarantee I come to him, he’s locked my six-year-old sister in a cage.
So the heirs spring a trap. Lure him to the fortress. Take Missy back. End him on our ground.
He walks through the gate smiling, a signed blood contract in his hand. Claiming I was promised to him before I wasborn.
Blood contracts don’t break. Not by law. Not by fire. If the magic holds, I don’t belong to the four men willing to die for me.
I belong to the monster who caged a child to complete his set.