Dincler

The word Dincler can mean Mythic chaos, mythical, legendary, or even, mythically chaotic. in irish mythology the name is also used when referring to nightmars or dream demons

Person 1: how have you been sleeping lately?

Person 2: terribly I've been seeing Dinclers in my nightmare lately. It's been scaring me.

Or

Person 1: do you remember the Dincler we learned about in history yestyesterday?

Person 2: heck yeah! Coolest myth ever.