User blog comment:Xilinoc/Ch. 612 - DIRTY/@comment-26028768-20150122184009/@comment-2126888-20150122222757

Yhwach's are at least three pupils roaming around, while the Soul King's look like four pupils in a diamond shape. Since Yhwach's future-seeing power comes from his eyeballs, it stands to reason that the Soul King's future-sight powers also originate from his eyes (or are at least a symptom). Probably something to bring up on the talk page at for the appearance section.