Lena’s not your typical animal trainer. And when she and her unicorn partner, Steve, decide to enter a fight, it’s definitely not your typical fight…
...you had me at "her unicorn partner, Steve".
This is a quick and quirky story set in the world of [b:Hold Me Closer, Necromancer|8041873|Hold Me Closer, Necromancer (Necromancer, #1)|Lish McBride|https://d.gr-assets.com/books/1402325074s/8041873.jpg|12671757].
There are cage fights between a slew of mythical creatures. There is a unicorn named Steve. And the story ends with the main characters (figuratively) riding off into the sunset.
I haven't read the Necromancer series, but I think I seriously have to now.