Celebrationmk10
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For the post-Moon Lord launcher, see Celebration Mk2.

Map view of a medium Celebrationmk10 world.
Celebrationmk10 is a secret world seed. It celebrates Terraria's tenth birthday, May 16, 2021.
The following seeds can be used to generate a Celebrationmk10 world (case-insensitive):[1]
celebrationmk10
05162011
5162011
05162021
5162021
World generation changes
Overall
- The spawn point is changed to either Ocean in the world, implying most of the spawns usually happening in the inner third of the world will happen in the left or right sixth of the world.
- Andrew the Guide, Whitney the Steampunker, Yorai the Princess, a Party Girl, and an Angora Town Bunny will also spawn there and a Party immediately starts.
- A majority of the world is painted: The Dungeon is in deep pink, Living Trees, the Pyramid, and Clouds on Floating Island are painted in pink, the Jungle Temple is painted with purple tiles and cyan walls, and all Sand Blocks, grass, and surface objects are painted in cyan.
- There are even more Living Trees than in a drunk world.
- Items in Chests always have a "best" modifier[2].
- Accessories will have one of the +4 modifiers (Lucky, Menacing, Quick, Warding).
- Weapons will have modifiers with the most stat increases, according to their damage type. The possible modifiers are:
- Legendary, Godly, or Ruthless for melee weapons
- Unreal, Demonic, or Ruthless for ranged weapons
- Mythical, Demonic, or Ruthless for magic and summon weapons
- Note that this generation is beyond the "modifier limit". For example, it is possible to get a flail with the Legendary modifier, which is impossible in a normal world.
- Half of the Underground Cabins have their tiles and walls replaced with Rainbow Bricks, and a half of the remaining ones are painted with a diagonal rainbow pattern.
- Glowing Mushroom biomes are painted, with Giant Glowing Mushrooms painted in rainbow color and Mushroom grass painted in the same random color.
- Gem Trees are more common, similarly to the drunk world.
- All Floating Islands have Hallowed grass and a Hallowed Water Fountain.
- Like the No traps seed, Bouncy Boulders may generate as traps.
- Water pools near the Aether biome are replaced with Shimmer pools.
- The maximum number of Enchanted Sword Shrines is doubled, but the probability for one shrine to spawn is halved, except the first one which is guaranteed.
- The chances for a Lava Charm to be generated in a chest is increased from
5*1/20 (5%) to6.67*1/15 (6.67%).
Desert
- The Desert generates without its usual entrance but with a single Pyramid.
- The Chest in the Pyramid always contains a Pharaoh's set in addition to its normal loot.
- The caves of the Underground Desert are smaller.
Other changes
- Two unique enemies can be encountered in this seed:
- The Jungle Mimic can be found in the Hardmode Jungle.
- Golden Slimes can rarely spawn.
- Fairies have a higher spawn rate in the Cavern layer.[3] All Fairies have a
83.33*5/6 (83.33%) chance to be a Pink Fairy. The latter effect does not apply to get fixed boi worlds.[4] - Biome Mimics have a higher spawn rate.[5]
- Hearts and Stars can always spawn as their seasonal variants.
- All Fallen Star projectiles (including those from the Star Cannon, but not those from the Super Star Shooter) are pink.
- The chance for a Blood Moon to occur is raised to
16.67*1/6 (16.67%) (from11.11*1/9 (11.11%)) per night. - The drop chance of the Rod of Discord is raised to
1*1/100 (1%) (from0.2*1/500 (0.2%)). - Fireflies and Butterflies are more common.[6]
- The chance of obtaining a developer set from a Treasure Bag is doubled, from
6.25*1/16 (6.25%) to12.5*1/8 (12.5%). Developer sets can still only be dropped from Hardmode bosses' Treasure Bags (except Queen Slime's), however.[7] - The chance for a Meteor Shower is increased from
10*1/10 (10%) to20*1/5 (20%), and chance for a night to have an increased Fallen Star rate is increased from33.33*1/3 (33.33%) to50*1/2 (50%).[8] - More clouds spawn in the background and more of them have a special shape.
- The Steampunker and the Princess can always spawn.
- Every non-evil tree grows as a vanity tree, and all trees are painted in a rainbow pattern (including evil trees).
- Most bosses (including the Celestial Pillars and the bosses' minions, but except the Leeches, Servants of Cthulhu, King Slime, Queen Slime, Plantera, Golem, Betsy, Lunatic Cultist, and the Moon Lord) are smaller than normal.
- The Traveling Merchant always sells 2 more items than normal.
- The Princess sells rare items:
- Slime Staff
- Heart Lantern
- Flask of Party
- Sandstorm in a Bottle (while in the Desert)
- Terragrim (during a Blood Moon)
- Pirate Staff (after beating a Pirate Invasion in Hardmode, during the following moon phases:
)
- Discount Card (after beating a Pirate Invasion in Hardmode, during the following moon phases:
)
- Lucky Coin (after beating a Pirate Invasion in Hardmode, during the following moon phases:
)
- Coin Gun (after beating a Pirate Invasion in Hardmode, during the following moon phases:
)
- The Wizard Hat grants an additional minion slot.
- The player explodes into confetti upon death.
- Palm Trees drop 3 times as much wood on average (each tile of tree drops 2–4 corresponding wood).
- Sand, Hardened Sand, and Sandstone Blocks will always be painted cyan when placed.
While generating
- All generation descriptions and tips become pink.
- The Underground Hallow music will be played.
World icons
The world icon of a Celebrationmk10 world is a Pink Sakura tree with a bowknot.
Notes
- Due to the way certain invasion mechanics work, Goblin Scouts and Martian Probes will spawn in the middle of the world, rather than the edges. Note that invasion events like Goblin Army will take place near the initial spawn point or Town NPCs, so in Celebrationmk10 worlds they will take place at the Ocean which the player spawned at by default.
Tips
- Starting with the spawn at the Ocean makes the game easier if the player is on the Dungeon side but much harder if on the Jungle side. It may be worth generating a new world if starting on the Jungle side.
Trivia
- The names of three of the starting NPCs in the Celebrationmk10 seed are the names of three members of Re-Logic: Redigit (Andrew), Cenx (Whitney), and Yoraiz0r (Yorai).
- Unlike most of the other secret seeds, the Celebrationmk10 seed is interpreted as a number, so any number of 0s can be added in the front (e.g.
000005162011
). In addition, there are numerous unintended strings that generate this secret seed (due to the use of the CRC-32 algorithm[9]), such as (case-sensitive):
Thirst of dress
engineer governor reproduction
inform Representative yorai
History
- Desktop 1.4.4:
- Pre-Hardmode bosses and Queen Slime's Treasure Bags no longer yield developer items.
- Now the Glowing Mushroom biomes are also painted in rainbow color.
- Water pools near the Aether biome are replaced with Shimmer pools.
- When generating, all texts become pink and the Underground Hallow music will be played.
- Probably other undocumented changes.
- Desktop 1.4.2.3: Introduced.
References
- ↑ Information taken from the
Desktop 1.4.4.9 source code, methods
GenerateWorld()
inTerraria.WorldGen.cs
andProcessSpecialWorldSeeds()
inTerraria.GameContent.UI.States.UIWorldCreation.cs
. - ↑ Information taken from the
Desktop 1.4.4.4 source code, method
ImproveAllChestContents()
inTerraria.WorldGen.cs
. There may be inaccuracies, as the currentDesktop version is 1.4.4.9.
- ↑ Information taken from the
Desktop 1.4.4.5 source code, method
SpawnNPC()
inTerraria.NPC.cs
. There may be inaccuracies, as the currentDesktop version is 1.4.4.9.
- ↑ Information taken from the
Desktop 1.4.4.5 source code, methods
SpawnNPC()
inTerraria.NPC.cs
andTrySpawningFairies()
inTerraria.GameContent.Events.MysticLogFairiesEvent.cs
. The original33.33*1/3 (33.33%) chance to spawn as Pink Fairy + (66.67*2/3 (66.67%) chance to spawn as other colors ×75*3/4 (75%) chance for other colors to become a Pink Fairy) =83.33*5/6 (83.33%) chance. There may be inaccuracies, as the currentDesktop version is 1.4.4.9.
- ↑ Information taken from the
Desktop 1.4.4.5 source code, method
SpawnNPC()
inTerraria.NPC.cs
. There may be inaccuracies, as the currentDesktop version is 1.4.4.9.
- ↑ Information taken from the
Desktop 1.4.3.6 source code, method
setFireflyChance()
inTerraria.NPC.cs
. There may be inaccuracies, as the currentDesktop version is 1.4.4.9.
- ↑ Information taken from the
Desktop 1.4.4.5 source code, methods
TryGettingDevArmor()
inTerraria.Player.cs
andOpenBossBag()
inTerraria.Player.cs
. There may be inaccuracies, as the currentDesktop version is 1.4.4.9.
- ↑ Information taken from the
Desktop 1.4.4.9 source code, method
NightSetup()
inTerraria.Star.cs
. - ↑ Information taken from the
Desktop 1.4.3.6 source code, method
SetSeed()
inTerraria.IO.WorldFileData.cs
. There may be inaccuracies, as the currentDesktop version is 1.4.4.9.