I have to ask what those reasons were.
MouseKeyboard
It's an interesting idea. I'm not a huge fan of chaotic random penalties though so I don't think it's for me.
Had a look at his Twitter
That guy needs to wake up one day and choose therapy
r/curatedtumblr
Because without darkvision you automatically fail (and get hit by advantage/disadvantage for unseen attacker/target).
Remember, total darkness is -5 to passive perception even if you have darkvision.
Damn and I just posted the cure for cancer.
That was a few thousand years before Celts were around.
Edit: It was also pretty slow; it was a couple of hundred miles across and took three thousand years to disappear, so it's on the order of a few miles in a lifetime.
Fun fact: Celts were originally central European, but the British Isles and Brittany were the only places Celtic culture survived the Romans.
After strength, charisma, and constitution do you think they have the intelligence for that?
Dubrovnik
Unless you only had one d6 that sounds like a player problem, not a class problem.