The world of Mystera is made up of many floors, with the surface map of Galebrook being floor 1. Directly below is floor 2, the Underground, and below that is floor 3, the Deep Cave. These floors can be reached by building stairways.
On the Deep Cave floor you can find an existing hole (or dig one of your own with a shovel) to enter the Underworld, which spans floors 4 to infinity. Each floor is generated when first reached by a player, and then resets every seven days.
Each Underworld floor is a labyrinth of rooms and tunnels with destructable walls. You cannot build stairways in the Underworld, however you can use a shovel for a chance to dig a hole to the next floor down to speed your descent.
The types of monsters found are more dangerous as you descend deeper into the Underworld; however, gem rocks, altars, skeletons of dead players, statues of mercy, chests and more can be found in greater and greater concentrations.
Exiting the Underworld
While each Underworld level is linked by generated stairways, there are no stairways exiting the Underworld itself. Nor can any be built; in order to leave the Underworld you must: use an escape rope (while on the topmost Underworld floor in order to reach the Deep Cave floor and leave from there), use an Escape Lantern, or find a Statue of Mercy.
Escape ropes are crafted, and allow you to travel up one floor each before being consumed. Statues of Mercy are interactive objects that can spawn on all Underworld floors and which teleport you to a random location on the surface. Escape Lanterns, dropped by Flame Demons and Dust Devils, do the same unless you are bound to a Recall Tile.
- Escape Rope: 20 tinder, 5 silver.
- Recall Tile: 1 dragon scale, 1 escape lantern, 10 gold
Recall Tiles can be built on the surface and you can walk on them to bind yourself to one of them.
Underworld Recall Tiles
There are also (different) recall tiles in the Underworld, which can randomly spawn on all Underworld floors like Statues of Mercy and other interactive Underworld objects can. If you walk on one you become bound to it and can teleport to a random location on that floor using a Depth Recall potion, significantly shortening return trips to the Underworld.
- Depth Recall: 1 dragon scale, 1 blue dye, 1 gold
This does not overwrite any Recall Tile on the surface you may be bound to, however; or visa versa.
Exclusive Spawns and Items
- Chest: can spawn loot of quality that scales with your questing level and the level of the dungeon.
- Dark Chest: spawns a small amount of gold, a watcher, a chaos, and a skeleton lord
- Crystal Rock: a rock which, when mined, can yield gems which are used in smithing
- Skeleton: If a player dies in any way, their remains can be found on the same underworld level as their player level was on death
- Table: Created for the monsters in the underworld to dine on. Destroy it for wood and more spawns. No, a player probably did not place it and you're not stepping on anyone's toes by destroying it.
- Altar: something about multiplying items, making you hungry or full, spawning monsters or rarely a dog. wew dog.
- Fountain: Fully restores your HP.
- Statue of mercy: Takes you back to overworld.
- Underworld recall tile: Reminds you of your position in UW. By using a Depth Recall potion you are able to start at last stepped recall tile.
Traps cannot be seen until stepped on, "consuming" them.
- Mud: Slows you for -800 movement speed. Move around or use Caraway (+100 each Caraway) to get rid of the slow.
- Pitfall: A hole opens up to the next floor; you'll probably fall in.
- Spike Trap: Deals some percentage damage of your health when stepped on.
Sometimes found in chests.
- Blunt Dagger: A comparatively weak weapon.
- Dark Hero Platemail: Heavy armor.
- Dark Memento: Assassin/Destruction accessory.
- Leather Armor: Medium armor.
- Strange Device: Why do you ask me? :v
Crystal Rock Yields
Object Spawn mechanics
Each floor can house a certain number of spawned objects (rocks, altars, fountains, etc.), and once that number is reached, little more will spawn. However, if you break a table, mine a rock, use up a fountain, or otherwise remove something which was spawned, another item can spawn. This does not account for what was used up, meaning that a destroyed table can yield an altar and a used up fountain can yield a regular rock elsewhere in that underworld level.
Monsters of any level can spawn at any point in the underworld but will typically stick to the floors outlined in the table. This is a result of abnormal spawns from altars and the "rare spawn mechanic" which will occasionally place a monster from many floors deeper in the underworld in a more shallow floor.
|Giant Bat||All floors||100HP||4 dmg||650ms||1 armor||-?-||10 myst|
|Drops: Raw Meat|
|Serpent||All floors||140HP||12 dmg||800ms||3 armor||-?-||17 myst|
|Drops: Raw Meat|
|Skeleton||All floors||160HP||18 dmg||900ms||3 armor||-?-||21 myst|
|Drops: Bones, Silver|
|Slime||All floors||100HP||13 dmg||900ms||1 armor||-?-||14 myst|
|Duplicates in combat; copies can also multiply further.
Drops: Bones, Salmonberries
|Snake||All floors||80HP||3 dmg||750ms||1 armor||-?-||9 myst|
|Drops: Raw Meat|
|Water Sprite||All floors||50HP||3 dmg||800ms||1 armor||-?-||6 myst|
|Drops: Clay, Mud, Healing Potion|
|Goblin||Floors 7+||150HP||6 dmg||800ms||1 armor||-?-||17 myst|
|Can steal one unequipped item or stack of items from your inventory.
Drops: Clay, Dirt, Mud, Tinder, Stolen Player Items
|Nether Leech||Floors 12+||100HP||22 dmg||800ms||3 armor||-?-||21 myst|
|Attacks cause 10 hunger.
Drops: Aloe Seeds, Raw Meat
|Fallen Knight||Floors 12+||250HP||30 dmg||1500ms||8 armor||-?-||36 myst|
|Drops: Bronze, Guardian Rings, Silver, Warrior Rings|
|Watcher||Floors 14+||150HP||8 dmg||800ms||2 armor||-?-||17 myst|
|Attacks slow (up to -600).
Drops: Spices (caraway) (rare)
|Flame Demon||Floors 16+||450HP||20 dmg||500ms||4 armor||-?-||42 myst|
|All damage ignores armor.
Drops: Charcoal, Escape Lanterns, Gems (citrine, topaz)
|Mage||Floors 17+||100HP||14 dmg||1000ms||2 armor||-?-||14 myst|
|Attack is ranged. All damage ignores armor.
Drops: Silver, Tinder
|Skeleton Lord||Floors 19+||400HP||25 dmg||900ms||4 armor||-?-||44 myst|
|Spawns skeletons. Spawned skeletons give no myst/experience and despawn shortly.
Drops: Bones, Gems (emeralds, rubies)
|Reaper||Floors 20+||300HP||20 dmg||600ms||3 armor||-?-||33 myst|
|Teleports and pursues no matter where you go.
Drops: Reapers can turn into Underworld Chests when defeated
|Rust Golem||Floors 22+||400HP||40 dmg||800ms||5 armor||-?-||52 myst|
|Drops: Copper, Dirt, Escape Ropes, Repair Kits|
|Red Bones||Floors 24+||380HP||40 dmg||900ms||5 armor||-?-||52 myst|
|Drops: Bones, Clay, Spices (coriander)|
|Green Dragon||Floors 26+||600HP||40 dmg||1000ms||5 armor||-?-||69 myst|
|Shoots fireballs in straight lines for insane damage; you can be hit repeatedly if running away.
Drops: Bones, Dragon Scales, Gems (emeralds, rubies)
|Creeper||Floors 30+||600HP||60 dmg||1000ms||6 armor||-?-||74 myst|
|Invisible until in melee range, turns invisible again out of combat.
Drops: Clay, Silver, Scholar's Lens
|Shroomie||Floors 32+||400HP||30 dmg||900ms||3 armor||-?-||46 myst|
|Heals other monsters. Healing range is huge.
Drops: Aloe, Healing Potion
|Ghost||Floors 40+||1000HP||70 dmg||900ms||0 armor||-?-||124 myst|
|Can shift through obstacles, including monsters and players.
Drops: Gold (very rare), Spices (black pepper)
|Archmage||Floors 41+||350HP||30 dmg||1000ms||4 armor||-?-||43 myst|
|Attack is ranged. All damage ignores armor.
Drops: Spices (coriander), Tinder
|Hive Soldier||Floors 44+||400HP||25 dmg||600ms||2 armor||-?-||46 myst|
|Spawns more hive soldiers when hit, up to 6. All damage ignores armor.
|Haunted Remains||Floors 43+||500HP||70 dmg||1000ms||4 armor||-?-||86 myst|
|Special attack has a chance to drain one level from your highest skill.
Drops: Paper, Silver, Spices (black pepper)
|Dust Devil||Floors 44+||600HP||80 dmg||500ms||10 armor||-?-||102 myst|
|Ranged attack, all attacks slow (up to -600). 25% damage ignores armor.
Drops: Charcoal, Escape Lanterns, Gems (garnets), Healing Potions, Silver
|Quill Beast||Floors 44+||1300HP||90 dmg||1000ms||10 armor||-?-||165 myst|
|Reflects back a percentage of damage taken. Some damage ignores armor.
Drops: Arrows, Gold, Raw Meat, Shard Trap
|Tentacle||Floors 50+||1200HP||120 dmg||1000ms||5 armor||-?-||193 myst|
|High damage ranged attack on a 5000ms delay.
Drops: Iron, Silver, Spices (black pepper)
|Ice Elemental||Floors 52+||1200HP||100 dmg||1500ms||10 armor||-?-||171 myst|
|Attacks slow (up to -600). Special attack slows -600 (up to -1200).
Drops: Obsidian, Spices (caraway)
|Dire Wolf||Floor 54+||1200HP||100 dmg||800ms||6 armor||-?-||171 myst|
|Moves at maximum speed. 25% damage ignores armor.
Drops: Bones, Pelts, Raw Meat
|Summoner||Floors 54+||800HP||70 dmg||800ms||5 armor||-?-||109 myst|
|Summons random creatures. 50% damage ignores armor.
Drops: Tinder, Tribe Relic
|Lich||Floors 58+||2500HP||130 dmg||800ms||5 armor||-?-||306 myst|
|Attack is ranged, teleports and pursues within zone. 50% damage ignores armor.
Drops: Bone Piles
|Ghost Blade||Floors 60+||3000HP||150 dmg||700ms||7 armor||-?-||372 myst|
|Uses Disorient to swap places with target (no cooldown). Reportedly slow movement, high armor piercing.
Drops: Hematite, Iron Bar, Iron Sword
|Mind Flayer||Floors 63+||3000HP||20 dmg||800ms||3 armor||-?-||240 myst|
|Does low damage ranged attacks that drains 10 armor per hit and stacks infinitely. Debuff lasts 5 seconds.
Drops: Black Pepper, Recall Potion