The term Colossus refers to the largest of arcane constructs.
Monstrous in its towering image, the Colossi come in various shapes, but most commonly resemble mighty beings or gods of the old age. They are made of hard stone or decorative metals, usually bronze.  

“Much like with any other construct, they can be destroyed by sustaining heavy damage, or by destroying their soulstone through the eye slits or other weak points…when dealing with the Colossi, both highly unachievable.”