What Eternal Engine Does

Eternal Engine is Max Stamina +75% — the top of the stamina family, above Infinite Stamina (+50%) and Fit as a Fiddle (+25%). Stamina is what mounts spend on sprinting, gliding, and swimming, so this is the single best quality-of-life passive a travel mount can carry — sprints last dramatically longer.

It stacks with the lower tiers (+150% with all three) and pairs naturally with the speed stack ( Swift and friends) on a dedicated mount.

How to Get It

There are two routes. It occasionally rolls on wild Pals, but as a rare-weight passive it's roughly 20× less likely than a common one. The reliable route is Disposable Implant: Eternal Engine , applied at the Pal Surgery Table — the surgery is free, but the implant is consumed.

The implant comes from the Ancient Relic Recycler : every recycled Ancient Relic of any grade rolls one disposable implant from a 16-implant pool, so it lands at 6.25% per recycle. See the Ancient Relics guide and the implants guide for details.