When any creature makes physical contact with you (unarmed strikes or grappling) you can use your reaction to attempt to infect them with your spores, if you are attacking or grappling a creature you can use your bonus action to do this.

You force the creature you're targeting, to make a Constitution saving throw (DC 8 + your proficiency bonus + your Wisdom modifier) if they fail they take 1d4 Necrotic damage (1d6 at level at 6th level, 1d8 at 10th level, 1d10 at 14th level), an enemy who fails this saving throw is considered infected. You can use your action to target an infected enemy and attempt to assimilate with them, they must make a Charisma saving throw (DC 8 + your proficiency bonus + your Wisdom modifier) if the creature fails they regard you as an ally and will not attempt to harm you, or your allies, this effect ends if you or your allies try to do anything harmful to the creature.

You have advantage on saving throws against being charmed or frightened. 

• You do not require sleep, and can't be put to sleep magically. You can long rest by spending 4 hours in an inactive but conscious state in a moderately warm, moist, dark environment.
• You do not need to actively breath but still require oxygen to live. You feed off of dead or dying plants and animal matter, which are readily available in the wild, rather than traditional food.
• You have a weakness to fire damage
• You have a resistance to poison damage, and advantage on saving throws against being poisoned.