Guldo

Guldos are an enemy species in Xenoblade Chronicles 2. They are humanoid zombie-like creatures embedded with Core Crystals. Guldos have the unique ability to absorb a 's element during battle.

Xenoblade Chronicles 2
Guldos are found exclusively in the Land of Morytha. Two types of Guldos can be found, a smaller type and a much bigger type that is fought exclusively as a boss and quest-exclusive enemy.

The Architect reveals that the Guldos were originally human survivors from his world. They used Core Crystals (originally a product of mankind's quest for immortality) to replace their brain cells in an attempt to survive. This resulted in them mutating into horrible abominations.