Aegis of Makash

From publisher blurb: Service in the Imperial blockade of Unthara is a difficult and thankless job. Danger threatens from many directions: the Brotherhood, grim and greedy mercenaries lured by Khaynite gold to break the blockade, and—perhaps worst of all—the foul necromancer Xon and his quickslaver allies. Despite this, the commander of the marines aboard the Imperial Alliance warship Cassandra’s Smile received a blessing both familial and divine in the form of an enchanted trident, imbued with powers that give the quickslavers pause.