The Secret Sanctuary - Sanctuary Guardian, #1

Descendants of gods. Fated Guardians. High school students.  Reeling from the revelation of ancestral links they never knew existed, Telara and her friends must learn to harness their newly emerging powers bestowed from the gods.  Guided by an abrasive alpha, the gang must also learn control if they hope to protect innocent lives from the Shadow Master. This malevolent enemy longs to enslave the world and drain it of its magic.  No Guardian has ever faced the Shadow Master and lived.
But that evil relic has never faced Telara and her friends. Call forth Mount Olympus, there's a new band of Demi-gods in town. And they refuse to be swallowed by shadows like those who came before them.  From award-winning author T. L. Shively comes a gripping YA fantasy that will keep readers on the edge of their seats until the very last page!