Black Thallus Antennae are rare materials in Xenoblade Chronicles X. They can be obtained from black Thalluses in Noctilum.
Sources
| Enemy | Level | Area |
|---|---|---|
| Echo Thallus | 11-20 | Noctilum |
| False Thallus | 21-30 | Noctilum |
| Cunning Thallus | 41-50 | Noctilum |
| Pizelle, the Purple Lightning | 40 | Noctilum |