The Renegade World Series Series by Jessica Palmer

Zelia is a priestess with sky-blue skin and strange tempers. Half-human and half-air elemental, she lives uneasily in the College of Healers. Perceived as an outsider, and declared a renegade, she is nevertheless chosen for strange and dangerous task. Ares is an opportunist and adventurer. Neither elf nor human he is another outsider, welcomed by no one, mortal or otherwise... moreZelia is a priestess with sky-blue skin and strange tempers. Half-human and half-air elemental, she lives uneasily in the College of Healers. Perceived as an outsider, and declared a renegade, she is nevertheless chosen for strange and dangerous task. Ares is an opportunist and adventurer. Neither elf nor human he is another outsider, welcomed by no one, mortal or otherwise. Misfit and outcast meet, and together they discover the possess unimaginable powers of sorcery which they will need to combat the scourge that threatens the land. For the evil necromanceer Queb, long thought dead, has returned... less

In a sacred circle between the planes, Zelia and Ares are to be united in wedlock. Elementals mix with humans in a ceremony, set to dazzle the eye, but chaos ensues when the fire elementals escape onto the mortal plane and rage unchecked across the southern continent. When their watery and airy cousins join them the delicate balance between the planes is disturbed, and the fabric of magic torn asunder... moreIn a sacred circle between the planes, Zelia and Ares are to be united in wedlock. Elementals mix with humans in a ceremony, set to dazzle the eye, but chaos ensues when the fire elementals escape onto the mortal plane and rage unchecked across the southern continent. When their watery and airy cousins join them the delicate balance between the planes is disturbed, and the fabric of magic torn asunder. As time shifts out of sequence and the cycle of the seasons are disrupted, Zelia and Ares must once more combine forces to return order to the land or risk its utter destruction. less

The third in the "Renegade Series". Zelia and Ares watch with relief as the goddess Sala is about to close the portals between the worlds. But as the doors slam shut there is an explosion and a hole is blasted through the planes, through which time falls.