Way of the fang monks are unlike any other monks they do not practice new martial arts. They hone their survival instincts going beyond the use of their hands and feet and biting tearing at the throats and feeding upon the flesh to restore themselves. They have tainted their ki energy making it toxic to other people able to disable them like the venom of a snake or purple worm. 

Lunge

At 3rd level in this subclass you once per turn when you make an attack you can make a lunge attack jumping upto 15ft towards the target and making an unarmed strike

Hunger

At 3rd level you also gain a predatory primal hunger you can spend a ki point to gain advantage on an unarmed strike. (1 ki point per attack)

Go for the throat

At 6th level you gain the ability to pin down a target on your turn when you make a lunge attack you can expend 2 ki points to land ontop of the target knocking them prone while knocked in this way the target is Considered prone and grappled by you.

Venomous

At 11th level the your ki energy becomes toxic to other beings once per turn when you land an unarmed strike you deal an additional 2D6 poison damage to the target this damage is considered magical for the purposes of overcoming resistance and immunity to non magical damage. At the cost of 1 ki point you can force the victim to make a constitution savingthrow against your ki DC or suffer one of the following effects.
• the creature is slowed as if by the slow spell until the start of your next turn
• The creature is poisoned for 1 minute
• the creature is blinded as if by the blindness deafness spell until the start of your next turn
• the creature has disadvantage on dexterity or strength checks and savingthrows until the start of your next turn.
• The creature has disadvantage on concentration checks until the start of your next turn.

Feast

At 17 level when you reduce a creature to 0 hp with a lunge attack you regain hit points equal to half the total damage dealt (rounded up) if this exceeds your current max hp you gain temporary hit points equal to the remaining hp provided you do not already have temporary hit points.