Barty's "Princes of the Apocalypse"

That was a clear threat! An unwarranted threat in response to a reasonable question. In Melek's mind, that gave them just cause for self-defense. Unsure of how Aldric will respond, but unable now to communicate with him, Melek wants to help his companion present the most intimidating presence possible. From his hiding place, Melek draws on his training from the temple, summoning the divine power to manifest minor wonders...

The flames of the campfire turn a deep blue, shrouding the campsite in an eerie glow.

(Casting Thaumaturgy)