Dionna’s Tinker by Ruby Ryan

Five sexy soldiers–a Warrior, a Frost Mage, a Tinker, a Ranger, and a Shadow–fight alongside Dionna in this Reverse Harem Paranormal Romance
Dragon Quintelaides aren’t meant to be split up—even for just a few days.
But that’s exactly what happens when Dionna’s Quint gets their marching orders: Arthur is called back to the Capitol to teach others his new self-healing ability, while Jaxon, Ryon, and Harry travel west to hunt down some hive remains.
Meanwhile, Dionna and Maze are sent to the south to work on a secret Tinker Guild project: a superweapon that can end the war against the Silithik in the blink of an eye.
But after a weapons test at the project site goes poorly, Dionna is left weaker than before. Which is awful timing, since she and Maze have to pay a visit to the gryphon capital city of Oorani to learn a secret runetracing spell. And the exiled Runemaster who knows the spell? She won’t give up her secret willingly.
Can Dionna regain her ability in time? Or will she fail the final superweapon test—and worse?