The Idoneth Deepkin are a mysterious race of aelves who inhabit the oceans of the Mortal Realms and emerge only to steal the souls of the earthbound, a grim harvest upon which their survival depends. When the Idoneth go to war, they bring with them a spectral manifestation of their pelagic home. In this shimmering tide advance the ruthless warriors and ferocious beasts of the abyss to overwhelm the disoriented prey. Behind them, they leave an eerie silence, as any survivors are reduced to a vacant stupor by the Idoneth's bewildering spells.

This book contains everything you need to know about the soul raiders of the seas, who harness the power of the depths and the creatures of the oceans to plunder the spiritual essences of the inhabitants of the Mortal Realms. Discover the genesis of the Idoneth, the nature of the debilitating curse that afflicts them, and the deceptive world of the submerged cities.

This 96-page hardcover book contains:

- A wealth of background on the mysterious Idoneth Deepkin, including their arcane origins and aquatic lifestyle
- Ethereal illustrations showcasing the majesty of the Idoneth Deepkin
- 18 war scrolls and Battlefield profiles for the noble Akhelian, the soul-hungry Namarti, and cruel sea beasts like Allopex and Leviadons
- Rules for the 6 main Enclaves of the Idoneth, as well as command traits, Artefacts of Power, spells, and battle traits like Forgotten Nightmares and Waves of Death
- Rules for the Road to Glory campaigns that allow you to raid the Mortal Realms in Idoneth spiritual incursions, along with 3 battalion scrolls to use in narrative games
- Balanced content including 4 Grand Strategies and 6 battle tactics to exploit against enemies
- A showcase of Idoneth Deepkin marine miniatures in the colors of the various Enclaves, with guides on how to paint them