Wulfgard: The Tomb of Ankhu - Wulfgard: Djedar Rath, #1

Deep in the southernmost deserts of Wulfgard lies the resting place of Pharaoh Ankhu the Endless, one of the greatest evils the land of Kemhet, or the world, has ever known. So terrible was his power that the gods themselves cursed him, sealing him away in an underground labyrinth. Ankhu rises with each darkening of the moon, a walking mummy, wandering this tomb in search of his own still-beating heart, without which he can never reach the afterlife.
Over untold ages, Ankhu's tomb remained undiscovered, a secret protected always by the loyal Medjai, an order sworn to guard Kemhet from all threats. And now, a new threat has arisen: Lord Tefnahkt the Red, a powerful warlock, drives his cult and his many slaves to uncover Pharaoh Ankhu's resting place and steal the mummy's power. While a small group of Medjai desperately work to stop Tefnahkt's plans, one slave may become the key to putting an end to this evil once and for all: Djedar Rath.
In a race against time, Djedar must lead the Medjai to prevent Tefnahkt from opening the tomb of Ankhu before the coming of the new moon, when the undead Pharaoh will awaken once more. For, if Ankhu escapes, the world will never survive his wrath.