Placoderms are the toughest of the Neriticans, being large and strong, and plated in thick scales that are almost impervious to blades. They are a war-like species, who organise themselves into warrior guilds, protecting the Trident Realm from any threat. Even in times of peace, they organise patrols relentlessly, always drilled, so that when the call to arms comes, every placoderm is ready to answer it. Predatory and bloodthirsty, the placoderms view all lesser forms of life as theirs to hunt.
Where their naiad cousins are swift and graceful, placoderms are steadfast and hardy. They rarely have numbers on their side, and so tend to adopt solid formations in battle, armed with huge spears and razorswords, and fighting with such grim efficiency as to crush even the strongest foe.