In diablo 2 resurrected, they should make the “Gem” in the lobby apply an affix.
Each time you activate the gem it grants a random affix to your game, when you deactivate it disables that affix. Then Perfect Gem activated grants 2 affixes.
/e
Copilot : Perhaps the affixes could range from increased item drop rates, enhanced experience gain, or even unique environmental effects. The possibilities are endless and could significantly enrich the gameplay experience.
Nah.
It might be something Diablo 4 players want though. If you own the game, you might head to the D4 forum and see what they think of copilots idea for the game. I don’t know if there is a chat gem in D4, but if the players marvel at copilots idea and the game doesn’t have a chat gem, they can always add one. 
Tron (1982)
I wish. Terror nights were so cool and fun I feel like the gem activation giving us a new bonus like terror nights would be amazing. I really miss terror nights