By the way, is there a 5e spell that would counteract the disadvantage? Darkness affects darkvision doesn’t it, so unless you’re a drow warlock with Devil’s Sight that’s not going to help you.
IIRC Elves don't have darkvision the same way a natural race does, but it's tied to their magical heritage where they can see part of the weave, so technically elves should lose darkvision if they're silenced, though I don't think this has ever been represented in game rules. I could be completely wrong though. I'm having trouble finding any info but I remember reading it once.
Edit: Elvish Darkvision is brought up in this video at 8:50 by MrRhexx
