Dionna’s Shadow by Ruby Ryan

The Hundred and Thirty-Third Quintelaide stands disgraced.

After assassinating the Archon and fleeing the Capitol, Dionna and her Quintmates are handling the fallout in different ways. Warrior Jaxon focuses on their path forward, while Frost Mage Arthur contemplates their place in history. Dionna doesn’t know how to feel about her decision to disobey the Archon, and the results that followed.
Ryon is handling it the worst. As the one to throw the blade, most of the responsibility falls on the Shadow. And although it was an easy decision, their only option to keep the Quint intact, he can’t close his eyes at night without seeing the face of their deceased leader, killed by his hand.

But Dionna’s Quint has a final mission to occupy their focus. If they can ambush the project site where the Tinker superweapons are produced, they can carry one north: beyond the Borderlands, to the Silithik Hivemind itself.
With a single bomb, they can end the war.

As they avoid Archenon patrols and make their way north, Dionna and her men are going to have to come to terms with what they’ve done—and what they intend to do if they reach the Hivemind. Because all six of them share one common fear: that whatever happens next will be the very last thing they do.