Practice session
Choose one boss and write a checklist for its summon, arena and healing. Record only kills from the same difficulty when tracking item odds.
Terraria icon
Sandbox & survival
Terraria
A side-view sandbox focused on exploration, gear progression, and boss fights.
Boss prep and accessory farming
What to track
Set aside separate materials for boss summons and crafting, and check that your recorded loot runs used the same difficulty.
Measure your resultsTools for Terraria
Probability
Terraria · Boss prep and accessory farming
Estimate the chance of at least one success from a known chance per boss reward roll.
Sandbox
Crafting Quantity Calculator
Scale recipe inputs for a specific number of crafting batches.
Sandbox
Resource Calculator
Find your remaining material requirement and the runs to cover it.
Probability
Loot Probability Calculator
Find the odds of getting at least one drop across multiple tries.
Guides and tutorials
Build a repeatable progression plan
Show an affordable pre-boss loadout and include an alternative if a key accessory is missing.
Calculate drop odds over several attempts
Use the chance of missing every roll to find the odds of at least one drop.
Read guideFrequently asked questions
Why separate Classic and Expert drops?
Difficulty changes reward rules and loot bags. Treat each source as a separate sample.
How can I practice boss prep and accessory farming?
Choose one boss and write a checklist for its summon, arena and healing. Record only kills from the same difficulty when tracking item odds.
