Each boss arena asks for a set of artifacts and creature tribute items, and the counts scale with difficulty. Enter the boss and the tier you plan to fight, and this lists exactly what to gather and the minimum level your character needs.
Tribute lookup
Artifacts
Creature tributes
How tributes scale
Artifacts are required at every difficulty — usually one of each named artifact. Creature tributes are where the difficulty shows: on Gamma many bosses need none, on Beta you bring a handful of each, and on Alpha you bring the most. The counts above are per item, so a Beta Broodmother asking for 5 of four tributes means 20 tribute items total.
The minimum level is your character level to enter the arena, not the level of the army you bring. Plan your tribute farm around the gap between your current level and that gate.
Frequently asked questions
Do I need the same artifacts on every difficulty? For these three Island bosses, yes — the artifact set is fixed and you bring one of each at every tier. Only the creature tribute counts grow with difficulty.
Why does Gamma need no creature tributes for some bosses? The Island bosses ask for creature tributes starting at Beta. Gamma is the entry difficulty and skips them, which is why it is the common first boss run.
Are these the only bosses? This calculator covers the three classic Island bosses (Broodmother, Megapithecus, Dragon). Map-specific arenas such as Manticore, Rockwell, and the Titans use their own tribute tables and are added as sources are verified.