Mimic Arcanist (Astra Academy Book 2) by Shami Stovall

School life. Camping. And a mysterious graveyard beneath the sea.

Gray and Sorin Lexly started Astra Academy with a bang. During their first few weeks, a professor tried to kill them, and even opened a portal to the abyssal hells-where the dead dwell.

But that's all behind them! The portal was destroyed. Time to focus on classes and studies. Or so Gray hopes.

During an Academy camping trip, Gray finds a fragment of the portal... and a few abyssal monsters that somehow crept their way into the world of the living. Determined to set things right, Gray informs Professor Helmith of what he found.

Unfortunately, there may be more fragments of the portal than just the one, which means more trouble lurks around every corner... including the possibility of a Death Lord arriving in the mortal world.