Phanatos, the Netherlord

Phanatos, the Netherlord is an enemy in Xenoblade Chronicles X that is only available while Blade Mission No. 20 is active, during the Squad Mission, which is unlocked after the two probes in The Insects' Fear are examined during said mission.

While it is the lowest level Yggralith, it is still a massive threat if you aren't properly equipped to handle gravity-based damage or large enemies in general.