Path Through the Ice Cave (2005)

`From the introduction:

At the end of the Age of Demons, just as the Giants began their rise to power, one fire giant struck a bargain with a powerful fiend, before the couatls could manage to bind him to the depths. This giant prince offered to hide the demon until after the scourging was complete. Seeing his imminent captivity, the fiend readily agreed. Little did he know that he was trading one form of captivity for another, as the hiding space was within the giant princes crown. Once the fiend was bound into the crown, the giant prince reneged on his bargain and used the knowledge of the demon to amass terrific power and attain everlasting life. Hidden away in a secret fortress deep in a jungle valley, the giant prince dreamt far greater dreams of conquest and total dominance.
...
"The mysterious Durvan, servant to dragons, has summoned you to Stormreach on the mystical continent of Xen’drik. You first met this strange warrior on the steps of a Xen’drik pyramid almost a year ago, where he cryptically warned you of the duplicity of your then employer –the changeling Tophran Damilek—which probably saved your life and thwarted much calamity wreaked upon the face of Eberron—Khorvaire at the very least.

"Since your arrival on this dangerous southern continent, you have been awhirl with activity. Durvan explained that a lone explorer entered Stormreach last Zor, shaking and shivering in the throws of a wasting illness. Before his enviable death he told a story of a strange frozen valley within the deep jungle, saying it was an ancient and powerful stronghold of an elusive whispering voice who spoke to him in the tongue of giants of a grand treasure for those who could “crack the ice” that surrounded it.

"In his delirium he gave only vague directions to this icy vale, but Durvan believes he has discovered the correct path, sending you up river toward a desolate section of jungle. In typical cryptic fashion, he shared he gave the following advice before you set off.

"'You have traversed the Lake of Fire and now you must enter the Valley of Ice. I’ll put you on the correct path, but be warned. You follow a dust trail of those who would disturb that which must rest.'

"That was almost a week ago. In the meantime you have been making your way via riverboat up some unnamed river to an area near the Valley of Ice. You awoke this morning with the valley in sight, the only thing that stand between you and the vale are miles of a thick, dark, and dangerous jungle."