So a dense cloud (which is an element which appears on both the art designs!) and a unit of resistance makes sense for something defensive!cu·mu·lus (kyōōm'yə-ləs)
n. pl. cu·mu·li (-lī')
A dense, white, fluffy, flat-based cloud with a multiple rounded top and a well-defined outline, usually formed by the ascent of thermally unstable air masses.