Antimagic Susceptibility. The caltrops are incapacitated while in the area of an antimagic field. If targeted by dispel magic, the caltrops must succeed on a Constitution saving throw against the caster's spell save DC or fall unconscious for 1 minute.   False Appearance. While the shield remains motionless, it is indistinguishable from a normal shield.   Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny caltrop. The swarm can't regain hit points or gain temporary hit points.