The meeting mostly consisted of King Nitok asking questions, frankly, one would have expected a more stern ambiance when dealing with the king of all undead, or even, just anyone that carried such a crushing presence alongside their every movements, it felt like he could have just willed to turn anyone present to dust, that was how powerful he was.
And even then, the idea they were making of his strength was most certainly far lesser than the truth, they had not seen him do anything other than just being present in the same room.