From publisher blurb:
A Mortal's Guide to Meir is a unique steam-punk setting for 5e. This one-of-a-kind campaign world inspired by Victorian literature is perfect for swashbuckling, science fiction, dark fantasy, mythic fantasy, mystery, or intrigue adventures. This 279-page book contains all the tools you need to make adventures and characters that would be at home in the books of Robert Louis Stevenson, Sir Arthur Conan Doyle, H.G. Wells, Jules Verne, Bram Stoker, Lewis Carroll, Alexandre Dumas, Rudyard Kipling, and other 19th century authors.
A Mortal’s Guide to Meir includes:
A world of steam, steel, and magic, with 9 separate nations and 62 settlements, each with its own unique adventure hooks.
Tips for creating different types of adventures that match different literary genres.
40 new races, including half-races, monstrous and aberrant races, and planar races
48 new subclasses, 4 for each of the 12 base classes, specifically designed for a Victorian steam-punk setting.
1 new class, the Voyager, with 4 subclasses. The Voyager embodies the courage and adventuresome spirit of the Victorian protagonist.
153 new backgrounds - one for every possible combination of two skill proficiencies.
26 new weapons, including firearms and explosives (and four new siege weapons).
Lots of new equipment, tools, and steam-powered technology.
5 new mounts and expanded and refined rules for mounted combat
15 new vehicles, including steam-powered vehicles and ships, and rules for creating custom ships.
140 new magic items.
New rules for weather and environment, including 22 natural hazards, to make the wilderness a treacherous foe.
Stat blocks for 55 new monsters and 21 unique NPCs, along with templates to create your own combined creatures, elemental-infused creatures, celestial or fiendish creatures, steam-powered constructs, and arctic, sea, and desert creatures.
87 new spells, along with special rules for discovering high-level spells and casting them as mass rituals involving multiple characters.