"Danger!" is a TCG-exclusive archetype of DARK monsters that debuted in Cybernetic Horizon.
The "Danger!" monsters are based on cryptids, animals of questionable existence, from around the world.
The deck aims to amass card advantage from various discard effects. Combined with the "Dark World" and the "Fabled" archetypes, they can quickly amass huge field advantage.
Cards like "Ceremonial Bell" and "Respect Play" can seriously disrupt this deck's strategy by simply revealing the monsters before their owner gets to even reveal them by their own effect. As their effects work only in the hand or in the GY, they're weak to "Debunk", "Shadow-Imprisoning Mirror" and "Gravekeeper's Watcher" (discarding is NOT a cost for their effects).