Codex Umbra

The Codex Umbra is a character-exclusive item that Maxwell starts the game with.
=== Don't Starve ===
When used in Don't Starve, it sacrifices 15 health and 55 of maximum Sanity to spawn a Shadow Puppet clone of Maxwell. It has infinite durability and requires 2 Nightmare Fuel to be used. For each puppet active, Maxwell's maximum sanity is reduced, similar to how Meat Effigies reduce maximum health. A maximum of 3 puppets can be active at one time and each one will disappear 2.5 days after it was summoned. If a Shadow Puppet is killed or despawns, Maxwell will get the used max sanity back.
=== Don't Starve Together===
In Don't Starve Together, the Codex Umbra can be crafted from the Shadow Magic Filter and Survivor Items Filter, using two Papyrus, two Nightmare Fuel and costing 50 Health. It has a durability of 20 uses and does not break if it reaches 0%. Nightmare Fuel repairs 25% durability. It has a UI for choosing to summon between Shadow Servants, Duelists, Sneaks and Prisons. Creating puppets costs 30 max sanity and does not cost health, meaning hat Maxwell can hold up to 6 Puppets at a time. 
Shadow Duelists behave differently from their Don't Starve counterparts, having the ability to dash to the enemy and enter a defensive stance, blocking some of the incoming damage.
Shadow Prison traps enemies in range in place, making them unable to move for 24 seconds (Bosses get trapped for half the duration). Most enemies that are below the ground level, as well as some units (Like Crab Guards) are immune to this ability. 
Shadow Sneak sets up a shadow trap that activates once a non-boss unit enters the activation zone, influencing all units in range of about 1.5 tile. Influenced units will flee for 12 seconds, even if they get attacked. This ability can be used to transform Rabbits, Bunnymen, and Splumonkeys into their nightmare variants, regardless of how much sanity the Players have. Shadow Prison and shadow Sneak can be activated at 0 sanity.
Shadow Worker Crafting image.png|link=Shadow_Puppet#Shadow_Worker|Shadow Worker
Shadow Duelist Crafting image.png|link=Shadow_Puppet#Shadow_Duelist|Shadow Duelist
Shadow Prison Crafting image.png|link=Shadow_Traps#Shadow_Prison|Shadow Prison
Shadow Sneak Crafting image.png|link=Shadow_Traps#Shadow_Sneak|Shadow Sneak
When the Codex Umbra reaches 0% durability, Maxwell has another quote for it:
== Origin==
The Codex Umbra's writer, origin, and age is currently unknown. What is known though, is that the book ends up on earth and is discovered by William Carter during his early years as a stage magician. The Codex's earliest appearance is in August of 1904. At the time, William was aboard a train heading to San Francisco, California from New York City.William Carter Puzzle #4: The Coach Ticket is dated August 15, 1904 and permits travel from New York's Grand Central Station to San Francisco. After the train crashes into a broken-down circus wagon, William disappears, and is assumed dead.William Carter Puzzle #4, The Newspaper: "A passenger​ train struck a circus wagon that had broken down along the tracks at the Old Mill crossing. Dozens of passengers were injured, and at least one man is missing. The missing man has yet to be identified, but fellow passengers described him as a tall, nervous fellow with an English accent. A search party was convened but quickly abandoned when it became apparent that a cage full of potentially dangerous trained monkeys had been vacated in the collision. Given the remoteness of the crash site, the scorching desert sun, and the escaped animals, the missing man has been presumed dead." In reality, William managed to escape after he uses the book's powers to assist Wolfgang in freeing him from the wreckage.
Months later, William established himself in San Francisco and began going by the name of Maxwell. Maxwell updated his act to incorporate dark manifestations that he taught himself to summon from the Codex Umbra.William Carter Puzzle #5: A new poster for "Maxwell the Great", a requisition for an ad in The San Francisco Call dated June 6, 1905, and a journal page recounting an encounter with a Shadow Creature after a ritual. He found great success in this new act and eventually hired an assistant, Charlie.William Carter Puzzle #6: New poster for "The Amazing Maxwell" featuring Charlie holding the Codex, and a letter from Charlie about their latest successful performance. In spite of this success, Maxwell is far more fixated with with the secrets and power the Codex, and gradually loses his sanity as he delves deeper and deeper into the book. During his last performance, Maxwell pushes his act to an extreme and attempts to pull "shadows incarnate" from the Codex. The book instead creates hands that pull both him and Charlie away into a parallel dimension.William Carter Puzzle #8: The Final Act (Youtube)
The Codex Umbra reappeared, still in Maxwell's possession, after he was dethroned and became a survivor. After reuniting with Wilson, Maxwell found the scientist's blueprints for an invention and offered to help construct it with assistance from the Codex Umbra. This made it possible for Maxwell and Wilson to build a portal that allowed other survivors to join forces with them.Cyclum Puzzles: Last page of the comic
== Trivia==
*Codex Umbra is Latin for "Shadow Manuscript" or "The Shadow Code".
*It's possible for the Codex Umbra to be set alight and burn into ashes. In Don't Starve, the book will re-appear in Maxwell's inventory upon re-loading the world.
*If using the Codex Umbra reduces Maxwell's health to zero, the Morgue will list the cause of death as "Shenanigans".
*Like Abigail's Flower, the Codex Umbra floats when placed on the ground, but only if the corresponding Maxwell is nearby. If he moves out of range, the book will close and fall to the ground.
*In the beta test of Maxwell's rework, when using the Codex Umbra, in addition to 4 items that were included in the final version of the update, it was possible to select a spell that allows you to turn the Top Hat in your inventory into a Magician's Top Hat.
== Bugs ==
*Despite being a starting character specific item, the Codex Umbra can be stolen by mobs like Krampus or Eyeplants.
*Using a Sinkhole to enter the Caves or Ruins without the Codex Umbra can sometimes cause it to duplicate in the player's inventory.
*In the Shipwrecked DLC, using a Volcano to climb onto it without the Codex Umbra can sometimes cause it to duplicate in the player's inventory.
== Gallery==
Reading Codex.jpg|Maxwell reading the Codex Umbra.
Shadow Summon.jpg|A puppet spawning (Look closer and you'll find Mr. Skitts).
Less max sanity.png|Maxwell's maximum Sanity after summoning a Puppet.
All's well that Maxwell.jpg|Maxwell and the Codex Umbra on the All's Well That Maxwell poster.
20170311065948_1.jpg|Maxwell beside the Codex Umbra (DST).
Valentines2017 1.png|Codex Umbra as seen on the 2017 Valentine Cards.
RWP MaxwellCR Codex Umbra animation concept.gif|Codex Umbra animation concept from Rhymes with Play "Maxwell's Character Refresh"
==References==
ru:Кодекс_Умбра
vi:Sách Vong Linh
Category:Sanity Loss
Category:Character-Specific
Category:Items
Category:Followers
Category:Flammable Objects
Category:Health Loss
Category:Lore
Category:Craftable Items
Category:Shadow Magic Filter
Category:Crafting Stations
Category:Mob Spawning Entities
Category:Fuel