The Pristine Corbicula rex egg is a pet unlock item which may be obtained by defeating Rathis at the Spirit Grove on Anachronia. It unlocks the pet Corbi. As with most boss pet items, the egg follows the drop threshold system; it has a base drop rate of 1/2000 and a threshold of 1000.
For an exhaustive list of all known sources for this item, see here
- ^ There is further information on this drop; see the associated page for details.
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- patch 26 April 2021 (Update):
- Rare drops from Rex Matriarchs will now consistently trigger a broadcast