entity_id,source_id,evidence_type,source_note
ENT_EMPUSA,SRC_ARISTOPHANES_FROGS,direct attestation,"Aristophanes, Frogs 293-295: the shape-shifting phantom of the underworld road."
ENT_EMPUSA,SRC_THEOI_HOME,index attestation,"Attested in Theoi Project index (Greek gods, spirits, heroes in classical literature)."
ENT_EMPUSA,SRC_THEOI_UNDERWORLD,index attestation,Literary attestation in classical/mythographic tradition; cult evidence varies by entity.