Accustomed at having the moon as the only
light in your days, you have superior vision in dark and dim
conditions. You can see in dim light within 30 feet of you as if
it were bright light, and in darkness as if it were dim light.
You can't discern color in darkness, only shades of gray.

Your moth wings grant you a flying speed of
20 feet. To be able to use this speed, you mustn't be wearing
heavy or medium armour.

Thanks to your long antennae you
have advantage on Wisdom (Perception) checks that rely on
smell.

Mothspeech is mainly a language of transmitted
pherormones, with few body language, and because of this it
can't be written. Also, it is impossible for other creatures
besides moths, butterflies or other bugs that use pheromones to comprehend this
language (although it is possible with magic), and many won't
even notice when you use it. Using Mothspeech, you can
communicate simple ideas to moths and butterflies, and
understand their "speech".