The Distorter: Fallen Queen
A dangerous place the country of Rylva has become in the Under Realm, where the cheya, fed up of humans running their country into the ground, are trying to topple Queen Lupa from her hard-earned throne.
48-year old Poppy Lesauvage, who is 16 cheya years old, must flee to Solilica for her safety, which means leaving friends and family behind. She'd rather die than do that, but when ancient magic threatens to define her existence, she knows it would be best for all if she left.
Meanwhile, 20-year old Rotod is an assassin deployed by the Hessain, and now he must complete one task - a task that will, according to his master Klaud, save the Under Realm and preserve the Empire. It is unknown whether Tod's killer persona will either live to serve him, or live to destroy him.
Alfonso is 125 years old and, as a former war hero, is called to fight for Lupa once more. Having left many years ago to be with the one he loved, he is still held in contempt by a lot of his former comrades. Life may be long for cheya, but he may never see his children again.
If you don't fight in Under, you're going under.
I would like to give credit to and thank @My_Idiosyncrasies for the amazing front cover! :)