An Implant Without a Source

Implant: Mastery of Fasting exists in the game's item data as a permanent key item, but no shop, loot table, or reward currently hands it out — and the Pal Surgery Table never asks for it. The passive is wired to the disposable version instead, so treat this item as an unused leftover: you can't get it, and surgery doesn't need it.

How to Get Mastery of Fasting Instead

Mastery of Fasting (hunger drains 20% slower — the top of the family above Dainty Eater and Diet Lover , both of which are plain gold surgeries) is applied with Disposable Implant: Mastery of Fasting : the surgery itself is free, but the implant is consumed. Disposable implants come from the Ancient Relic Recycler — every recycled Ancient Relic of any grade rolls one implant from a 16-implant pool, so Mastery of Fasting lands at 6.25% per recycle. It's a comfort pick, so let the combat and work implants from the same pool take priority. See the Ancient Relics guide for the reward tables and the implants guide for how surgery works.