The Destruction of Walls. Starfire Angels: Forgotten Worlds, #5

Although sworn to protect Nya, L'Ni despises her. However, she won't let his hatred of the An'shel or his lethal skills stop her from confronting him. She'll find a way to break that wall, even if she has to volunteer as his punching bag. She has little else to do while her wings recover from the damage inflicted on Kurtuz. Or at least she thinks she doesn't. While the Iludrin has been floating in empty, interstellar space, Shen has been experimenting on the new ship.
Those experiments have left them vulnerable, which they discover when two groups of boarders appear on the Iludrin, each with their own nefarious purpose. However, what they discover could offer an opportunity to impede the plans of the Issan, if everyone can work together, especially L'Ni and Nya.