Two more MBs! Both of the still semi-new Clarity attribute.
Planestacks are a creature of both Synthesis and Clarity. They aren’t well-known at all.
They’re made out of many square planes of a strange glassy material, each taking on one of many colours. The stack of planes spirals and slides around dynamically as the creature moves, branching off into four similar but smaller stacks that form the limbs. They have a rather loosely-composed body; I drew the planes right up against each other but they can have varying amounts of space between them.