The Quest — Adrian Howell

The psionic war, once thought to be at an end, has been reignited by the rise of a new and exceptionally powerful Angel master. Escaping the fall of their psionic city with a group of refugee children in tow, Adrian and his team face the daunting challenge of keeping their young charges alive as the Guardians are slowly pushed to the brink of destruction. To reunite his family and put an end to the Angel onslaught, Adrian agrees to join a perilous expedition to the far side of the world. There he will seek his answers from a living god... answers that will tell him whether the Guardians have any chance of turning the war around, or if this world of chaos is only the beginning...
(The Quest is the fourth book of Adrian Howell's PSIONIC Pentalogy)

Read all five books of Adrian Howell's PSIONIC Pentalogy in order:

Book One: Wild-born
Book Two: The Tower
Book Three: Lesser Gods
Book Four: The Quest
Book Five: Guardian Angel