Website and data research by 101Leafy.
Echidna Heart
エキドナの心 · Relic
An orb that holds the soul of Echidna
Price 10Sells for 5
No shop sells it, no chest holds it, no enemy drops it, and 101Leafy has not found a story event that gives it.
Shin Megami Tensei Wiki by 101LeafyAll Demons Index