Episode 33: Surrender, vile brigands!
Our intrepid misadventurers attempt to liberate the ruins of Lady Eleanor and Lord Cedric's mansion from the hands of the Zhentarim, and one of their character builds has a chance to shine...
You can always find the rest here :)
Why can the barbarian turn invisible at will?
Cause they're a firbolg
If you play a globrif you can only become visible once a day.
That was the description from Volo's, it was updated in Mordenkainen's. It's multiple times now, equal to proficiency bonus.