What Do Elcor Perceive?
Elcor’s sense of smell is extremely powerful. With a whiff of their surroundings, they can receive a flood of information about their location and the people around them. An elcor can even smell a corpse from miles away, as seen in the book Annihilation. Some situations can even be painful to them due to sensory overload.
The information they receive has to be interpreted. It still allows them to get a good understanding of their homeworld and other places they travel to, like the Citadel.