The first step to a Symbiote Monk is getting a Symbiote and you have done just that. As a Symbiote Monk you gain a Symbiote form that enhances your body put does also come with its negatives. This form can have any appearance you want it to have as long as it does not Add limbs or change any function. You gain features att level 3,6,11 and 17.

 

Symbiote Form

As a Bonus Action you can equip the symbiotes body a a sort of armor. Doing this increases your strength modifier by 1 and gives you temporary hitpoints equal to your level. These temporary hitpoints can only be healed via either spending hit dice on a short rest or taking a long rest. But this form also comes with its negatives. These negatives are that while you are in this form you have a voulnerability to thunder damage and you also have disadvantage on persuasion checks. In this form you also stick to walls but not the roof.          This form only drops when you use your Bonus Action to do so or die.

Symbiotic limbs

As an Action you cause parts om you're symbiotic self to stretch out of your limbs. When you do this you can either attempt to grapple someone from 15 ft away instead of five. otherwise you can send it up to 30 ft onto a surface. when you do this it can hold your bodyweight plus half your carrying capacity. This is usefull for pulling stuff or swinging from one ledge to another. You can grapple an additional target on level 6, 11, 17. You also reach and extra 10 ft with the swinging ability att the same milestones

Symbiote Camo/Coat

In Symbiote form you can use you're Action to camoflauge with the area around you. doig this means that you turn invisible but its only usable when you are in contact with a surface larger than yourself. In Regular form you have a passive ability that causes you to be coverd in an invisible, almost noticable layer over your body. This means you leave no fingerprint and leave less marks. The GM dicides the stelth bonus you get from this.

Size change/Symbiote Strength

In Symbiote form you now have the ability to manipulate you're size. You can spend your Action changing you're size by up to you're strength modifier (with symbiote bonus) in ft. This can not reduce you're size bellow youre regular size. In base form you can use your Bonus Action while picking something up to cause your symbiote body to stretch out onto the object you're carrying causing you to have double strength modifier on checks to carry that object and an advantage on that same roll.

Symbiotic Adaptation

You're symbiote has bonded fully to you. When you take damage you can spend your reaction to gain resistance to that damage untill the end of the attacking creatures next turn. You also gain the ability to evolve features to help you survive for example turning ampibious while underwater or growing fings while Falling a distance longer than 30 ft or being in the air for an entire turn. This works in both forms