Blazing Gas Sacs are unique materials in Xenoblade Chronicles X. They can be obtain from Sphinxes. They are needed to craft Potential Up augments of rank X or better.
Sources[]
| Enemy | Level | Area |
|---|---|---|
| Durvin, the Perceptive | 70 | Primordia |
| Feliciano, the All-Seeing | 70 | Oblivia |