Ruinous Oath requires more than ordinary Crimson Cavern completion. The documented gate is level 750, 5,000,000 C$, and full Shiny plus Sparkling coverage for the required cavern entries. Normal completion can look finished while the pedestal remains locked.
Confirm the Real Ruinous Oath Gate
Check the live rod prompt and the Crimson Cavern collection state before beginning. Separate four questions: is the area unlocked, is the base entry caught, is the Shiny state complete, and is the Sparkling state complete?
Complete Both Special Bestiary States
Work row by row. Mark each missing Shiny or Sparkling result rather than repeating the whole cavern without a target. When a catch fails to count, confirm that it belongs to the required location and carries the exact state shown by the Bestiary.
Prepare the Level and Currency
Reach level 750 and keep the documented 5,000,000 C$ available. Do not assume a long collection grind guarantees that the price stayed unchanged. The live pedestal remains the final authority.
Check the Crimson Pedestal Before Paying
Return to the pedestal beside the Crimson King after the collection state updates. Read every unmet condition. If the game shows a missing row, solve that row; if it shows no reason, rejoin once and inspect the Bestiary again before reporting a bug.
Decide Whether the Rod Matches Your Play
Ruinous Oath rewards a demanding perfect-catch style. It is a poor immediate target if the collection gate is complete but the catch mechanic is still inconsistent. Finish the unlock only when the rod's role fits the activity you want next.