There IS someone sharing the large chamber with Coda. Just as he enters into the room, he cannot help but notice the large leonine creature sprawled on silken pillows just to his north. The powerful, tawny body dominates the cushions, while a long tail coils around thick legs that end in sharp claws.
A man reclines just above the giant cat, curls of black hair atop his head neatly groomed to a well-trimmed beard. His bare chest of taut muscle rises and falls with shallow breath, and his kohl-rimmed eyes are closed in apparent slumber.
Coda then realizes that he does not see a man and his pet lion, but rather that the man's body merges into the cat-like form! He recognizes this creature as a lamia, known to be vain and evil with seductive charm.
OOC:
I apologize for the lack of clarity in the map. I meant for the gray boxes to indicate areas beyond the field of vision. I will instead use solid black, and I've moved Coda back towards the party since the reveal would likely change his action.
Map