Every Event In Terraria (& How To Start Them)

Terraria presents numerous obstacles and challenges that aim to test players in a way that engages them, driving them to overcome the difficulties presented. These tribulations often consist of formidable enemies, deadly bosses, and even locations like the perilous Dungeon. However, the most enjoyable yet demanding challenges occur during world-influencing occurrences, known as Events — temporary occasions often defined by distinct changes to visuals, the atmosphere, and the enemies that spawn alongside their frequency.

Events play a pivotal part in Terraria, chiefly acting as a means of blowing off steam or, more importantly, acquiring tools and items that help players progress through the game. Most world-influencing occurrences happen when players use event-summoning items — not to be confused with items that summon minions — or begin upon meeting particular circumstances, as others happen randomly without any discernable causation. These happenings are crucial for players; thus, here is every Event in Terraria — and how to start them.

The Party

The Party is an Event where one to three NPCs have a celebration, not for anything in particular, just for fun and cake. This impromptu jamboree is primarily visual as NPCs, and some creatures, wear Party Hats as balloons decorate the background. However, the Clothier and Party Girl will sell novelty and vanity items available during this time. The Party is one of the Events that are fun, problem-free, and exempt from any other stressors.

World State	Pre-Hardmode
Event Type	Peaceful
Event Duration	Lasts from dawn till dusk (4:30 AM-7:30 PM).
Event Requirements	Has a chance of being initiated each dawn by one to three NPCs or can be triggered manually using a Party Center.
Event Start Messages	"Looks like <NPC name> is throwing a party!" "Looks like <NPC name> and <NPC name> are throwing a party" "Looks like <NPC name>, <NPC name>, and <NPC name> are throwing a party"
Event End Messages	"Party time's over!"

The Lantern Night

The Lantern Night is an Event where the world celebrates players for their triumph against a boss or invasion for the first time — they also occur randomly following the defeat of the Moon Lord. This tranquil observance is almost entirely visual as countless lanterns fly in the background. Yet, the Party Girl will sell a Release Lantern for players to join in the celebration. Thus, allowing players the opportunity to unwind and revel in their triumphs.

World State	Pre-Hardmode
Event Type	Peaceful
Event Duration	Lasts from dusk till dawn (7:30 PM-4:30 AM)
Event Requirements	Occurs the night after a boss or invasion has been defeated for the first time or randomly at dusk after the Moon Lord has been defeated.
Event Start Messages	None
Event End Messages	None

The Blood Moon

The Blood Moon is an Event where the moon turns a foreboding crimson shade, its ominous glow corrupting everything. This paranormal lunar phase changes the world visually and affects creatures and enemies. During the Blood Moon, passive critters become hostile, enemy spawn rates increase, particular enemies can open doors, and new enemies will appear. This Event makes nighttime which is already dangerous, far more deadly.

World State	Pre-Hardmode
Event Type	Time-Limited
Event Duration	Lasts from dusk till dawn (7:30 PM-4:30 AM)
Event Requirements	Has a chance of happening each dusk when the moon is present once one player has more than 120 Health or can be triggered manually using a Blood Tear.
Event Start Messages	"The Blood Moon is rising..."
Event End Messages	None

The Goblin Invasion

The Goblin Invasion is an Event where a goblin army attacks players relentlessly until they are defeated. This sudden offensive sees players fend against waves of goblins that use sheer strength and numbers to their advantage. Should players overcome the last wave, the army of goblins will retreat in defeat, and the Goblin Tinkerer will spawn in the world, who is a necessary NPC for progressing the game and reaching the end.

World State	Pre-Hardmode
Event Type	Invasion
Event Duration	Lasts until the Goblin Invasion is defeated.
Event Requirements	Has a chance of happening each dawn once a Crimson Heart or Shadow Orb has been destroyed and one player has more than 200 Health or can be summoned using a Goblin Battle Standard.
Event Start Messages	"A goblin army is approaching from the west!" "A goblin army is approaching from the east!" "A goblin army has arrived!"
Event End Messages	"A goblin army has been defeated!"

Slime Rain

Slime Rain is an Event where slime rains down from the sky instead of the usual precipitation. This unnatural weather has slimes shower down onto the world, and should players slay enough, specifically 150, summon the boss King Slime. Slime Rain is an inconsequential Event at best, but it does provide players a significant amount of coins and unique items should they slay slimes and meet the requirement for getting King Slime to emerge.

World State	Pre-Hardmode
Event Type	Time-Limited
Event Duration	Lasts around 9 to 15 in-game hours, or until King Slime is defeated or despawns.
Event Requirements	Has a chance of happening each day once one player has more than 140 Health and at least 8 Defense.
Event Start Messages	"Slime is falling from the sky!"
Event End Messages	"Slime has stopped falling from the sky."

The Old One's Army

The Old One's Army is an Event where evil forces from the world of Etheria attack players with the goal of conquest. This foray from another world has players face numerous waves of the Old One's Army that features a diverse assortment of enemies. Defeating the Old One's Army will provide players various rewards, including weapons, armor, and Defender Medals. These items are well worth overcoming the nefarious Old One's Army.

World State	Pre-Hardmode
Event Type	Invasion
Event Duration	Lasts until the Eternia Crystal is destroyed or the Old One's Army is defeated.
Event Requirements	Initiated by placing an Eternia Crystal on an Eternia Crystal Stand.
Event Start Messages	"The old one's army is approaching!"
Event End Messages	"The old one's army has been defeated!"

The Torch God

The Torch God is an Event where players face an enemy concealed in the form of their most trusted light source, Torches. This divine test has players fight the fiery Torch God, an unseen deity that presides over all Torches, keeping them forever-lit. Should players survive the Torch God's onslaught of fireballs, they receive the Torch God's Favor, a consumable item that allows players to convert Torches to a variant of their immediate biome.

World State	Pre-Hardmode
Event Type	Mini-Event
Event Duration	Lasts until the player dies, leaves the area, or once all nearby Torches have been spent.
Event Requirements	Initiated when around 100 torches accumulate in close proximity anywhere below the Surface layer.
Event Start Messages	None
Event End Messages	None

The Frost Legion

The Frost Legion is an Event where players must fight against hordes of killer snowmen equipped with snowballs, knives, and Tommy Guns. This frosty incursion only transpires during the Christmas season; after all, nothing says holiday cheer like the bloodthirsty, weapon-toting snowmen of the Frost Legion. If players defeat this army of snowmen, Santa Claus will appear and settle in, joining them until the Christmas season ends.

World State	Hardmode
Event Type	Invasion
Event Duration	Lasts until the Frost Legion is defeated.
Event Requirements	Summoned using a Snow Globe.
Event Start Messages	"The Frost Legion is approaching from the west!" "The Frost Legion is approaching from the east!" "The Frost Legion has arrived!
Event End Messages	"The Frost Legion has been defeated!"

The Solar Eclipse

The Solar Eclipse is an Event where the sun is shrouded by the moon, turning the day darker than night and prompting various monstrosities to appear. This celestial occurrence alters the world visually and dramatically changes the behavior of enemies. During the Solar Eclipse, enemy spawn rates increase, enemies can spawn almost anywhere, and new enemies will appear, making daytime far more grueling and deadlier than any night.

World State	Hardmode
Event Type	Time-Limited
Event Duration	Lasts from dawn till dusk (4:30 AM-7:30 PM).
Event Requirements	Has a chance of happening each dawn once a mechanical boss has been defeated or can be triggered manually using a Solar Tablet.
Event Start Messages	"A solar eclipse is happening!"
Event End Messages	None

The Pirate Invasion

The Pirate Invasion is an Event where seafaring miscreants invade players and plunder them for treasure. This surprise ransacking sees various pirates raiding players with waves of enemies that they must defeat to defend their allies and their bounty. Successfully fending against the Pirate Invasion will reward players with various pirate loot and the Pirate NPC, who boasts gear that will make nautical invaders think twice about pillaging.

World State	Hardmode
Event Type	Invasion
Event Duration	Lasts until the Pirate Invasion is defeated.
Event Requirements	Has a chance of happening each dusk once a Blood Altar or Demon Altar has been destroyed and one player has more than 200 Health or can be summoned using a Pirate Map.
Event Start Messages	"Pirates are approaching from the west!" "Pirates are approaching from the east!" "The pirates have arrived!"
Event End Messages	"The pirates have been defeated!"

The Pumpkin Moon

The Pumpkin Moon is an Event where Halloween-themed enemies of ghoulish and horrifying origin invade players. This supernatural raid has players fend against waves of ghastly foes alongside the petrifying Pumpking himself as light from the ominous moon cascades the night sky. If players overcome the sinister monsters and spirits of the Pumpkin Moon, they will receive numerous items and even release the Halloween spirit until dusk.

World State	Hardmode
Event Type	Invasion/Time-Limited
Event Duration	Lasts from dusk till dawn (4:30 AM-7:30 PM).
Event Requirements	Summoned at night using a Pumpkin Moon Medallion.
Event Start Messages	None
Event End Messages	None

The Frost Moon

The Frost Moon is an Event where Christmas-themed aggressors of whimsical and wondrous roots assail players. This joyous assault pits players against onslaughts of shockingly merry attackers led by the illustrious Ice Queen herself as the snowman-faced moon illuminates the night sky. Should players dominate this delighted invasion force, their reward will be bountiful items and the emergence of Christmas cheer until nightfall comes.

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World State	Hardmode
Event Type	Invasion/Time-Limited
Event Duration	Lasts from dusk till dawn (4:30 AM-7:30 PM).
Event Requirements	Summoned at night using a Naughty Present.
Event Start Messages	None
Event End Messages	None

Martian Madness

Martian Madness is an Event where aliens invade the planet, using their otherworldly gizmos and gadgets to their advantage. This unearthly encroachment has players utilize their resources to fend against unwavering Martian conquerors seeking to take the world of Terraria. Players that compromise the Martians' attempts can acquire their extraterrestrial tech, which proves more capable than the unadvanced items found on their planet.

World State	Hardmode
Event Type	Invasion
Event Duration	Lasts until the Martians are defeated.
Event Requirements	Initiated by letting a Martian Probe escape from view after detecting the player.
Event Start Messages	"Martians are invading!"
Event End Messages	"The Martians have been defeated!"

The Lunar Events

The Lunar Events is an Event divided into five stellar happenings involving four Celestial Pillars and the final boss of the game. During this planetary battle, players must protect the world of Terraria from intergalactic threats and the source of much suffering, the Moon Lord himself. If players beat this unfathomably challenging Event, they will have completed the game, leaving nothing more to be done. From then on, players need only equip themselves with exceedingly powerful endgame gear offered by the Lunar Events and relish their victory.

World State	Hardmode
Event Type	Invasion
Event Duration	Lasts until all four Celestial Pillars and the Moon Lord are defeated, or the player dies.
Event Requirements	Initiated by defeating the Lunatic Cultist.
Event Start Messages	"Celestial creatures are invading!"
Event End Messages	"Your mind goes numb..." "You are overwhelmed with pain..." "Otherworldly voices linger around you..." "Impending doom approaches..."

Halloween

Halloween is an Event that happens yearly, allowing Terrarians to embrace the horrific and the paranormal. During this season of ghouls, ghosts, and other horrors, players can dress in costumes, eat candy, and overcome their fears as unspeakable atrocities lurk in the night. Halloween only lasts for a limited time, so players must take advantage of all it offers and embrace the Halloween spirit before it rests for yet another year.

World State	Pre-Hardmode
Event Type	Seasonal/Time-Limited
Event Duration	Lasts from October 10th to November 1st, or from dawn till dusk (4:30 AM-7:30 PM) if triggered manually through the Pumpkin Moon.
Event Requirements	It is the Halloween season or triggered manually by completing 15 waves of the Pumpkin Moon.
Event Start Messages	"The spirit of Halloween penetrates the air..."
Event End Messages	"The spirit of Halloween rests..."

Christmas

Christmas is an Event that comes every year as Terrarians gather to give and find joy in each other's company. Throughout this time of gifts, decorations, and merriment, players can spread cheer and offer presents to others without expecting anything in turn. Christmas does not go on very long, meaning players should capitalize on the opportunity to be joyous and welcome Christmas cheer before it fades, disappearing until the season reappears.

World State	Pre-Hardmode
Event Type	Seasonal/Time-Limited
Event Duration	Lasts from December 15th to December 31st, or from dawn till dusk (4:30 AM-7:30 PM) if triggered manually through the Frost Moon.
Event Requirements	It is the Christmas season or triggered manually by completing 15 waves of the Frost Moon
Event Start Messages	"The spirit of Christmas spreads cheer..."
Event End Messages	"The spirit of Christmas fades..."

Terraria is available on PC, PS Vita, PS3, PS4, PS5, Xbox 360, Xbox One, Xbox Series X/S, Nintendo Switch, Wii U, 3DS, IOS, Android, and Google Stadia.

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