Events are unique occurrences that provide interesting gameplay elements, such as new enemies and drops. Thorium adds a few things to existing events, increasing the amount of content the game offers.
- Main article: Blood Moon
Several new enemies are added, including a mini-boss, Patch Werk. Completing at least one Blood Moon and defeating Patch Werk is necessary for the Confused Zombie NPC to move in. Completing a Blood Moon is also essential for the progression of a Healer character, as an important Healer item, Unholy Shards, drops from Blood Moon enemies and is necessary to craft core Healer items. In addition, there are a plethora of other new drops from the event. The Blood Moon Medallion allows the player to summon a Blood Moon on any night.
- Main article: Snow
During Hardmode Blizzards several new enemies and a new boss called the Borean Strider may spawn. The Borean Strider has fast attacks and may prove challenging for unprepared players, but it drops several ice-themed weapons that make it worthwhile to fight. It also has an Expert Mode exclusive Treasure Bag. The Rain Stone allows the player to make it rain and stop the rain at will.
- Main article: Goblin Army
- Main article: Pirate Invasion
One new enemy, the Sea-Shanty Singer is added, as well as a few new drops that can assist the player.
- Main article: Frost Legion
- Main article: Solar Eclipse
Two new enemies, Le Fantôme and Scissor Stalker, are added, as well as a couple new weapons and Broken Hero Fragments, a crafting material that can be used to create ranged, magic, throwing, and radiant equivalents to the True Night's Edge and True Excalibur.
- Main article: Martian Madness
Several new drops that can assist the player are added. Weapons from this event will have their damage increased from the Conduit armor.
2 new items, the Halloween Center and Christmas Center, allow the player to activate Halloween or Christmas respectively, causing the seasonal drops and enemies to appear as though it was that time period.
Old One's Army
|Blizzard • Blood Moon • Frost Moon • Frost Legion • Goblin Army • Lunar Events • Martian Madness • Old One's Army • Pirate Invasion • Pumpkin Moon • Solar Eclipse|
|Combat||Artificer's Energy • Crowd Control • Minions • Out of Combat • Special Ability|
|Environment||Events • Music • Status messages|
|Thrower||Thrower Exhaustion • Technique Scrolls|
|Healer||Additional Healing • Auras • Healing Effects|
|Bard||Empowerments • Inspiration • Big Instruments|
|Items||Consumable • Crafting stations (By Hand) • Drops • Modifiers • Rarity • Vanilla item recipes|
|Game||Fishing • Game controls • Mod Calls • Mod Config settings • NPC names|
|Player||Buffs and Debuffs • Damage reduction • Death Prevention • Defense • Resource • Life Shield|