Immortals of Ollanhar — Robert E. Keller

As the Divine Knights head out to sea, strange terrors await them. The quest for the Green Flamestone is nearing its end, but all is not as it appears to be. The evil wizard Vorhevia plots against them with inhuman intelligence, and the Deep Shadow is at its strongest, sending forth creatures they could never have imagined.Meanwhile, Lannon Sunshield must confront his inner darkness before it destroys his companions and the hopes of Dremlock Kingdom. The true nature of Lannon's struggle to avoid the fate of his predecessors is at last revealed--along with a horrific secret that will change the Dark Watchman forever.