Constructs are s monster type in Diablo 4 that were added in Season 3: Season of the Construct.
What are the Constructs?
The Constructs are mechanical creatures powered by the elements and were created by Zoltan Kulle and Ayushan to protect the Loom inside the Vaults below Sanctuary. The Constructs first appeared in Diablo 3 in Act 2 inside the Unknown Depths.
With Kulle now dead, the Constructs have been left inside the Vaults and are now under the control of the evil forces Malphas, a servant of Diablo.
Construct Types
Constructs have different variants and as they are powered by different elements, they have different abilities, strengths, and weaknesses.