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|Your name's Percival?|
A core isotope was an object in the core of a meteor/comet. Ratchet could collect one from the Vela comet using Aphelion's ship tether and bring it to a Vullard researcher. They were of interest to the Vullard League of Celestial Oddities, in order to create a new form of energy from the isotope.
- Ratchet & Clank Future: A Crack in Time (first appearance)