A formidable rook, represented as a blocky, powerful humanoid with a head shaped like a robust hippocampus, featuring distinct, curved ridges. Its body is constructed from interlocking plates of solid, dark gray matter, armored with thick, synapse-like bolts of polished bronze. The texture is rough and irregular, mimicking the complexity of a neural network at a microscopic level, projecting an unyielding, protective presence.