The Elder Myconid

Your patron is a sentient mushroom connected to a hive-mind-like network of creatures infected by its mycelium. You are now also a part of that network, able to channel arcane power through the mycelium.

Champion of Mushrooms

At 1st level, you acquire the training necessary to effectively arm yourself for battle. You gain proficiency with medium armor, shields, and martial weapons.

The influence of your patron also allows you to mystically channel mycelium through a particular weapon. Whenever you finish a long rest, you can touch one weapon that you are proficient with and that lacks the two-handed property. When you attack with that weapon, you deal 1d8 extra poison damage. This benefit lasts until you finish a long rest. If you later gain the Pact of the Blade feature, this benefit extends to every pact weapon you conjure with that feature, no matter the weapon’s type. Each time you hit another creature with that weapon, you can use your bonus action to try and make it part of the mycelium network. It needs to pass a Wisdom saving throw with a DC= 8+your prof. bouns+your CHA modifier or become part of the network. All creatures that are part of the network obeys your commands, you being the Elder Myconid's closest servant. You can only bind a number of creatures equal to your CHA modifier.

Improved mycelium zombies

The maximum number of creatures you can have bound to yourself through the mycelium increases to 15+ your CHA modifier. You can now also use an action to see through their eyes and hear through their ears. If they are humanoid, they now also gain 3 levels in the fighter class and the subclass Myconid Warrior, unless they already have levels in another class. 

Marked mycelium

You can mark a piece of the mycelium as your own and rule there. All creatures that are in the area when you mark it become mycelium zombies under your control. You can also use the mycelium to do things, for example: Cause mycelium to rise up and restrain a creature in sight or create a protective wall in front of you. Your spores are now also so potent that they cause other people to hallucinate. You learn the minor illusion cantrip. It counts as a warlock cantrip for you and CHA is your spellcasting abillity for it. You also learn a number of illusion spells of a level that you can cast equal to your CHA modifier. They count as warlock spells for you and you can cast them each once without using a spell slot, then you have to use spell slots to cast them.

Mycelium Armor

You can create armor of mycelium. Choose a nonmagical type of light or medium armor. You can now,as a bonus action, cause mycelium to rise up from the ground and form around your body and give you the benefits of wearing that type of armor. The armor lasts for a number of minutes equal to your CHA modifier. While you are wearing the armor, you have vulnerability to acid, fire and piercing damage and reistance to bludgeoning, slashing and lightning damage.