He really needs cooling and calming influence from people like Waver; and coming from a big family, he's going to reach out a lot to avoid homesickness. And Waver is certainly

Tolkien magic is very.... very shortly-described; at best you can think of it as an application of will to affect one's self or environment. At this point, Celegorm can do small things related to wilderness survival, but also cast spells which utterly change his appearance, voice, etc.