The Index is an in-game UI tracker, not a Roblox badge. Use this page as a planning reference for Lucky Block priorities; the Index ETA tool models expected rolls and Premium block share.
Basic is the largest tier (≈10 animals by inference) and the easiest to complete. Hatch out the Index early so plot slots are never empty.
Legendary is the first tier where Premium Lucky Blocks materially outperform Standard rolls. The Index ETA tool surfaces Premium-only roll counts.
Beyond is the rarest tier (≈2 animals by inference) and the Index completion goal. At default priors, ≈1,000 Standard rolls per Beyond animal; ≈14 Premium-only rolls.
Gold ×2 / Diamond ×3 / Ruby ×5 / Emerald ×10 stack multiplicatively on top of the x2 Money gamepass and Friends bonus. Emerald is the apex mutation.
Keep entries useful by separating source-backed facts, player-tested strategy, and update timing.
Keep rarity, obtain method, abilities, and summary tied to official posts or repeatable in-game testing.
Link animals entries to matching builds, boss routes, and guide sections.
Keep tier values and obtain methods current after each game update.