Even with their third eye missing, these quigars still have theirs in another way...

Horns that grow over the third eye, covering it entirely. In its place, a rune that resembles an eye hovers over the quigar's head or between its horns.

• These horns can look like the example or resemble any other type, but must have this eye covering and eye rune.
• The style of the rune and covering can vary, so long as they are both present.
• The runic eye does not have to match the quigar's actual eyes.

If you're unsure if your idea is valid, feel free to ask.