[This gets a far simpler smile, infused with his usual warmth.]

As gracious as ever.

[From anyone else it might sound sarcastic. From Xichen, it is genuine gratitude for Wei Wuxian's kindness.]

This place does sound dangerous. I imagine these matters go well beyond fierce corpses and resentful energy, elsewise there would be little need for a warning.

[Elsewise it would just be business as usual, he means.]