Display for Magical Device

I'm making a D&D tabletop prop for tracking the three moons of Krynn.

I want to be able to display a line or two of text (16x2), but I don't want to use an OLED or something that looks like a display. I also don't want the refresh flicker from from eInk. I've thought about HPDL 1414s but they don't seem just right. Give me some ideas!

Thermochromic ink.
Change the temperature to make it appear and disappear, or change color.

Epaper
https://dronebotworkshop.com/epaper/