From publisher's blurb:
What is Land of Mist?
Land of Mist is a campaign backdrop and third party supplement for use with the popular role-playing game Old-School Essentials (OSE) Advanced Fantasy.
Inspired by classic tabletop fantasy worlds, it is a whimsical realm infused with magic and mystery.
Contained within the book:
A Unique Campaign World
9 Character Classes
7 Character Races
Options to play Enlightened Monsters, Hedgewitch Spell Casters, and Lycanthropes
Procedures for Underwater Adventuring, alternative Domain Management rules and an accompanying Mass Combat system
Rules for Dragon Riding and seeking the path to Immortality
Spell casting via Runes and summoning of Spirit Animals via Totems
Protocols for designing Artifacts
New spells, monsters, and more !
New classes and races include:
Aquatic Elves - Elven inhabitants of the Coral Islands and the ocean below.
Beastfolk - Fishers and foragers related to orcs, trolls and ogres.
Desert Druids - Holy cleric scholars who seek truth and peace.
Fairies - Fey of the deep Wildwoods.
Foresters - Protectors of the woodlands.
Gremlins - Mischievous city dwelling demihumans.
Moon Drow - Illusionary nocturnal spell casters.
Mystics - Transcendent martial arts warriors.
Rakes - Swashbuckling adventurers.
Bittles - Diminutive humans of the Lushglade rain forest.
Brutes - Robust prehistoric humans.
New character options include:
Enlightenment - Instructions for creating player characters from monsters of up to 4 Hit Dice.
Hedgewitches - Add limited spell casting abilities to any character without the complexity of multiclassing.
Lycanthropy - Simple options to play as a were-creature or other lycanthrope.
Variant Human Races - Prehistoric Brutes and lilliputian Bittles share the class and level options of other humans, with their own special abilities and requirements.
Cults - Established by the Immortals, religion and divine magic is practiced through one of the many cults in the Land of Mist.
Totems - Choose a sacred totem for your character and gain the ability to summon your totem animal by sacrificing hit points (HP) for their life force.
New game play options presented:
Underwater Adventuring - Take on the challenge of exploring the deep waters surrounding the islands and the Land within the Mist.
Domain Management - An alternative and complementary system to that presented in Old-School Essentials allows players to optionally share in the privileges and responsibilities of ruling a domain, while earning gold, experience, and War Dice for use in mass combat.
Mass Combat - A simple system for mass combat resolution, using Mass Combat Units. Units battle similarly to standard combat between characters, with options included for combat between units, characters, and monsters.
Runes - Used for secret writing or to infuse objects with spells via Power Runes.
Artifacts - Ancient magical constructs created by the Immortals, with powers and dangers beyond that of normal magic items.
Dragon Riding - Mist Dragons are companion flying mounts, with their own abilities.
Immortality - Found a cult and gain enough followers to ascend as an Immortal.