There are 3 books in the Stormlord series. The newest book is Stormlord's Exile which came out in 2011.

1
The Last Stormlord

Book cover of The Last Stormlord
'one of the very best Australian writers of fantasy fiction' NEXUS An absorbing new series about the most precious commodity of all - water - from the much-loved author of ISLES OF GLORY terelle, on the run from indentured servitude in a snuggery, finds refuge with a strange old man…
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2
Stormlord Rising

Book cover of Stormlord Rising
The second book in this gripping series of a deadly battle ...who will control the water? Shale Flint is forced to help the devious rainlord, taquar Sardonyx, in his quest to create rain - even though taquar's lust for power threatens to consume all that stands in his path. terelle…

3
Stormlord's Exile

Book cover of Stormlord's Exile
Shale is finally free from his greatest enemy. But now, he is responsible for bringing life-giving rain to all the people of the Quartern. He must stretch his powers to the limit or his people will die-if they don't meet a nomad's blade first. And while Shale's own highlords and…