Hazard Terrain
Hazard terrain is the environment fighting back - pit traps, spike pits, tripwires, pressure plates, bear traps, poison-dart tiles, and the open chasms that make tactical movement matter. Every decent dungeon has at least one; hazard pieces let the DM actually show them instead of narrating at an abstract.
Every piece is 3D printed in high-detail resin, unpainted and ready for rusted-iron drybrushing, blood-red accents, and the shadowed-depth washes that sell "don't step there." Combine with Floor and Door pieces for a complete trapped-corridor encounter.