Expert Mode is an option that can be selected during world creation. It greatly increases the difficulty of the game, as well as the quantity and quality of drops and the chances to obtain rare items. Furthermore, it offers certain exclusive content. Expert Mode begins the moment the Expert Mode world is created, and cannot be altered after that by the player. In Journey Mode, Expert Mode can be toggled using the difficulty slider.
- Most enemies have twice as much health, do about twice as much damage, and receive 10% less knockback.
- Enemies and bosses have new AIs with higher difficulty attack patterns.
- Enemies can spawn near NPCs, although they still will not spawn in front of placed background walls.
- Enemies drop more loot, including higher chances (usually 50% or 100% extra chance) to drop certain items.
- Some enemies inflict additional debuffs, or have an increased chance to inflict a debuff that they already inflict.
- Enemies can pick up coins dropped by enemies or players. Enemies holding dropped coins emit a sparkle effect based on the color of the best coin they are holding.
- Picked-up coins will be reset on NPC transformation, therefore the player cannot retrieve coins from enemies like spiders after they have transformed into their alternate form (from horizontal form to wall form, or reverse) or other enemies behaving similarly.
- Expert Mode enemies who steal the player's money will be saved in that area and respawn when the player returns. Their locations and how much money they carry is displayed on the minimap.
- Softcore/Classic players drop 75% of their coins upon death instead of 50%.
- The general respawn time is increased to 15 seconds, while respawn time during boss fights is increased to 30 seconds.
- Slime Rain can occur without its usual criteria, spawn rates are 15% higher, and Green/Purple Slimes have a higher spawn chance.
- Killing Pumpkin/Frost Moon enemies progresses the event twice as fast, due to the increased health of their enemies.
- The Traveling Merchant has a 50% chance to sell an additional item.
New enemy attacks
- Bats and Duke Fishron have a chance to inflict the Feral Bite debuff.
- Some Zombies carry a Zombie Arm, causing them to have an extended attack range and higher damage.
- Spiked Slimes can shoot up to 6 spikes at once in a small area around them.
- Some Skeletons can throw Bones.
- Lava Slimes leave behind a block of lava when killed.
- Jellyfish gain a new shock attack in which they move in a straight line and take no damage. Hitting them with a swung melee weapon, whip, or tool will incur damage to the player.
- Black Recluses and Jungle Creepers gain an additional spit attack which renders the player unable to move for a short duration.
- Granite Elementals can shield themselves from attacks, similar to Granite Golems, but will only do so if they have less than 50% health.
- Bosses in Expert Mode have increased health. Their health is boosted even further in multiplayer, with more health added for each player.
- Each boss has their own boost factor, which is a decimal number greater than 1. For example, Skeletron has a boost factor of 2.0 and Plantera has a boost factor of 1.4.
- In single player, Expert boss health follows this formula:
ExpertModeHealth = ClassicModeHealth × BoostFactor
- In multiplayer, Expert bosses multiply their health further based on the number of players:
ExpertModeHealth = ClassicModeHealth × BoostFactor × MultiplayerFactor
- The multiplayer factor is increased incrementally for each player:
MultiplayerFactor = 1 + HealthAdded + HealthAdded + ...
- The base amount of health added per player is 35%. That is,
HealthAdded = 0.35.
- Each consecutive player adds more health than the last:
HealthAdded[n+1] = HealthAdded[n] + (1 - HealthAdded[n]) ÷ 3
- If there are ten or more players, the multiplayer factor is modified using this formula:
MultiplayerFactor = (MultiplayerFactor × 2 + 8) ÷ 3
- The multiplayer factor cannot exceed 1,000. This limit is never reached in practice because it requires 1,498 players, and Terraria servers cannot have more than 255 players.
- The multiplayer factor is increased incrementally for each player:
- Boss health is determined at the time the boss is spawned. If a player joins the server after the boss has spawned, the boss's health will not update to account for the additional player.
- Most bosses gain a new attack or movement pattern which makes them more difficult. For example, Duke Fishron gains a third stage.
- When defeated, each boss (except for the Lunatic Cultist, Dark Mage, and Ogre) drops an Expert-exclusive Treasure Bag unique to that boss. Each Treasure Bag contains a greater quantity of the boss's usual drops from Classic Mode, along with unique Expert Mode-exclusive items. These items can all be used in non-Expert Mode worlds, with the exception of the Demon Heart. Hardmode bosses' Treasure Bags have an additional 5% chance to contain one random set of developer items (with the exception of Queen Slime). Treasure Bags can be opened in any difficulty.
- In multiplayer, all players that dealt damage to the boss will receive a Treasure Bag.
- Enemies drop 2.5 times as many coins.
- Pots drop more items when broken, and have higher chances for rare items.
- Fishing quest rewards give more money, and also have higher chances for better loot.
- Enemy banners offer more powerful buffs when placed.
- Hardmode Dungeon enemies have enhanced drop tables, and can drop two items at once.
- Pumpkin Moon and Frost Moon mini-bosses start to have a chance of dropping trophies on wave 10.
- Health regeneration is half as effective (three-quarters with Shiny Stone) without the Well Fed buff.
- Vampire Knives and Spectre armor healing is slightly less effective.
- The defense stat is more effective, 50% more effective than in Classic Mode.
- When touching the water in a Snow biome, the player is inflicted the Chilled debuff for as long as they stay in the water, and for five seconds after getting out.
- The following debuffs last twice as long when inflicted on players:
- A sixth accessory slot can be obtained by consuming a Demon Heart, which is an Expert-only item. The slot is permanent, but will only be active if a player is in an Expert or Master Mode world.
Expert Mode-exclusive items are found inside Treasure Bags dropped by bosses and generally have the rarity. While these items can only be obtained via an Expert Mode world, they still function in Classic worlds, excluding the Demon Heart.
|King Slime||Royal Gel||Most slimes become friendly and deal no damage to the player.|
|Eye of Cthulhu||Shield of Cthulhu||Double tap the ◀ Left or ▶ Right keys to perform a dash attack, which deals 30 damage and grants momentary invincibility upon hitting enemies.|
|Eater of Worlds||Worm Scarf||Reduces all damage taken by 17%.|
|Brain of Cthulhu||Brain of Confusion||Grants a chance to confuse nearby enemies after being struck.|
|Queen Bee||Hive Pack||Increases the strength of friendly bees by granting a 1/2 (50%) chance to replace them with larger, more damaging ones.|
|Skeletron||Bone Glove||Throws ricocheting crossbones when the player attacks, dealing 25 damage each.|
|Deerclops||Bone Helm||Summons homing Shadow Hand projectiles to damage nearby enemies, dealing 18 damage each.|
|Wall of Flesh||Demon Heart||Permanently increases the number of accessory slots by one.
Can only be used once. Only usable and takes effect in Expert and Master Mode.
|Queen Slime||Volatile Gelatin||Fires bouncing Volatile Gelatin balls at nearby enemies, dealing 65 damage each.|
|The Twins||Mechanical Wheel Piece||Used to craft the Minecart Upgrade Kit.|
|The Destroyer||Mechanical Wagon Piece||Used to craft the Minecart Upgrade Kit.|
|Skeletron Prime||Mechanical Battery Piece||Used to craft the Minecart Upgrade Kit.|
|Plantera||Spore Sac||Summons spores that hover around the player and travel toward nearby enemies before exploding, dealing 400 damage per second and inflicting the Poisoned debuff for 5–10 seconds.|
|Empress of Light||Soaring Insignia||Grants infinite flight time while increasing flight speed, movement speed, acceleration, and jump mobility.|
|Golem||Shiny Stone||Greatly increases health regeneration at an exponential rate from 10 to 40 health per second when not moving.|
|Duke Fishron||Shrimpy Truffle||Summons a mount with infinite flight time and gains a significant movement speed bonus when submerged in liquid or when the rider is below half health.|
|Mourning Wood||Witch's Broom||Summons a mount with infinite flight time and hovering.|
|Moon Lord||Gravity Globe||Allows the holder to reverse gravity, which can be toggled in midair.|
|Suspicious Looking Tentacle||Summons a light pet that detects nearby enemies, treasure, and ores.|
|Celestial Starboard||A wing that allows hovering and quick upward ascension. Highest mobility among wings.|
- Expert Mode's descriptive text, "Fortune & Glory, Kid.", is a quote from the 1984 American action-adventure film Indiana Jones and the Temple of Doom.
- Desktop 184.108.40.206:
- Added Soaring Insignia, Empress of Light's exclusive Expert Mode accessory.
- Added Volatile Gelatin, Queen Slime's exclusive Expert Mode accessory.
- Added Witch's Broom, Mourning Wood's exclusive Expert Mode mount.
- Added Celestial Starboard, Moon Lord's third exclusive Expert Mode item.
- Enemies who pick up coins in Expert Mode are now saved to a location when they despawn.
- 0x33 Aviators no longer drop from Treasure Bags opened by Hardcore characters in Expert Mode, but instead drop from Eye of Cthulhu normally in Master Mode.
- Desktop 220.127.116.11:
- Fixed hittable enemy projectiles not scaling in Expert Mode.
- Fixed air items being left over when monsters pick up coins in Expert Mode.
- Desktop 18.104.22.168: Introduced. Bosses now drop special Expert Mode-only items.
- Console 1.0.933.1: Introduced. ()
- Console 1.0.750.0: Introduced. ()
- Switch 1.0.711.6: Introduced.
- Mobile 22.214.171.124: Introduced.
- The increased defense is still less effective than Classic Mode, because enemy damage is multiplied by about 2 while damage reduction is only multiplied by 1.5. As a result, the player will take more than twice as much damage from enemies given the same amount of defense. For example, assuming the player is wearing full melee Adamantite armor (50 defense) with no other defense bonuses and gets hit by a Giant Bat (45 damage in Classic Mode). In Classic Mode, they get 25 damage reduction from 45 damage and take 20 damage. In Expert Mode, they get 38 damage reduction from 90 damage and take 52 damage.
- Information taken from the Desktop 126.96.36.199 source code, method
Terraria.Player.cs. There may be inaccuracies, as the current Desktop version is 188.8.131.52.