Krieg is referred to as a pirate overlord in the East Blue in the Secret Realm intelligence. He is assessed to be at Blue Mid‑tier level, used as a benchmark to estimate the power of stronger pirates like the Four Emperors. He is not directly seen but is a named threat that explorers in the Secret Realm might encounter. The file suggests defeating him as a milestone for earning a White Secret Mark. His presence reminds readers of the danger scale of the One Piece world.