"The Gods of Pegāna: Yug the Prophet" by Lord Dunsany

The picture used is "The Blinding of Elymas" (1516) by Agostino Veneziano (Agostino dei Musi). Elymas (a.k.a. Bar-Jesus) is a Biblical figure described as a mágos or sorcerer, i.e. a false prophet. Since Yug clearly isn't a legitimate prophet...

The follow along: https://gutenberg.org/cache/epub/8395/pg8395-images.html#YUG_THE_PROPHET