Talk:Excalibur/Umbra/@comment-2600:8801:8000:795:E85B:60F6:2D7D:ACC-20180615080903/@comment-2601:680:8100:84C8:E16F:6FA7:C95F:9212-20180615140236

It's intended to prevent any sort of help on Nightmare missions, so it was probably intended for it to affect Umbra too.