I have to ask what those reasons were.
MouseKeyboard
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.
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?
Isn't that just a war?
Does anyone actually run it that way though?
It sounds like the character has the same total level as the rest of the party, but can only use features from half of those levels, so it's going to be underpowered to the point of unplayability.
Unless you only had one d6 that sounds like a player problem, not a class problem.