@plancktumQuestion regarding the Ranger’s Companion: Is the prof. bonus of the ranger applied to all saves or only proficient ones? Just the ones it's proficient in.
— Jeremy Crawford (@JeremyECrawford) April 27, 2016
@ReubenFontanaDoes Hunter’s Mark target the ranger as well or just the target? Does beast companion benefit from it? How do you dispel? Hunter's mark targets the caster's quarry, not the caster too. And you dismiss it by ending your concentration (PH, 203).
— Jeremy Crawford (@JeremyECrawford) May 30, 2015