We are impervious to non-mystic attacks!
The constructs were devised to be the embodiment of the concept behind the game, Rock, Paper, Scissors. Along with this, the constructs were made to showcase the Mystic’s stasis ability.
While using stasis was the intended method for killing constructs, it is not actually a requirement. The constructs are not as invulnerable as the Rock Construct claims them to be. If the player(s) can do enough damage (1600 for Wood and Steel or 2000 for Rock) to an individual construct in less than one second (the cooldown on healing for constructs), then the player(s) can take down a construct group without the aid of a Mystic.
The constructs are great for necromancers to heal on. They are easy to ignore, and are the most common god in the godlands due to everyone ignoring them. They are a source of attack potions, and are an iconic enemy created by Wild Shadow. Deca Games later modified the Steel Construct to drop the Machine portal at a low rate.