Part of the three book AD&D2nd Odyssey Jakandor series, Island of War introduces the proud and honourable Knorr, barbarians exiled from their homeland. Their new refuge, the island of Jakandor, is unfortunately already home to the Charonti, a Broken People wielding foul necromantic magic.

The supplement explores the history and culture of the Knorr, including information on magic, new priest spells, character kits and skills. It also includes a colour map of the island based on Knorrman knowledge.