Shadow Archon
Protoss Preserver
- Location
- Louisiana
So going by Mass Effect canon, eezo most definitely did not form naturally in the way the Codex says it does, but in some other (unknown) fashion? Fair.
It could be a sideefect of a special type of magical coral reefs for all we know.
...Or asteroid remnants from a planet destroyed by a supernova sent spiraling through space for thousands to millions of years impacted the Leviathan's home planet before they evolved.
You don't have to immediately jump to "The codex is wrong."