The simplest quicksand could definitely kill even the strongest ability users who didn't have a domain yet, which was why the Godfather died back then.
However, this kind of trap would only annoy domain masters, especially complete domain masters, instead of bringing them danger.
The light element domain master sensed the change in his surroundings, and when he felt that he had just stepped into a quicksand area, the man scoffed and mobilized his domain to dispel the quicksand below his feet.
The light element domain now acted as the man's personal buff because this man got no one stepping into his domain, so his domain's strength was not fully displayed.
Still, with a burst of light pillar from the ball-shaped domain around the man, the quicksand area was blasted to pieces, creating a huge sandy hole emitting smoke within seconds.
