Spore Bringer
Starting at the 1st level, you can release a 10-foot radius of spores around you, these spores can only affect creatures with an Intelligence of 2 or higher that aren't undead, constructs, and elementals. Affect creatures can communicate telepathically with one another while they are within 20 feet of each other. This effect last for 1 hour.
Sun Sickness
While in sunlight, you have disadvantage on ability checks, attack rolls, and saving throws. You die if you are in direct sunlight for more than an hour.
Magical Adaptation
Although you cannot verbally speak, you have adapted and learned to use magic to your advantage. You know the Light cantrip and ignore the verbal component when using magic, you instead use a light to trace a arcane symbol in the air, and cast a spell that way.
Superior Darkvision
You can see in dim light within 120 feet as if it were bright light, and in darkness as if it was dim light. You can't discern color in darkness, only shades of gray.
Languages. You can read and write Common and Undercommon, due to being a Myconid you cannot verbally communicate with other sentient creature the traditional ways.