Deep in the mountains there lays a secret order of assassins known as the Lin Kuei. Over many generations they have perfected a unique form of ki manipulation that draws heat from their enemies, leaving them frozen solid.

Freeze

At level 3, as an action, you can make a ranged attack against one target within 30 feet. On a hit, the target takes cold damage equal to three times your martial arts die. Additionally, they must make a Dexterity saving throw or be encased in ice and are incapacitated until the end of their next turn. If the target takes damage from any source while frozen in this way, the damage is reduced to zero and the effect ends. You can use this ability once per long or short rest or by spending one ki point.

The save for this and all other Way of the Lin Kuei features is 8+proficiency+Wisdom modifier.

Frost Blade

At level 6, you can summon a weapon made of ice that lasts for one minute and can take the form of any one handed melee weapon without the reach property. You have proficiency with this weapon and it is considered a monk weapon. The weapon deals damage equal to your martial arts die plus your wisdom modifier and can be slashing, piercing, bludgeoning, or cold damage, decided when you first summon this weapon. You can use this ability once per long or short rest unless or you can spend 1 ki point to use it again.

Ice Clone

At level 11, as a reaction when an opponent attacks you with a melee attack, but before the attack roll, you can form a clone of yourself out of ice. This grants you a +5 to your AC. If this causes your opponent to miss they must make a dexterity saving throw or be affected by freeze feature. You can use this ability once per short or long rest, or you can spend 2 ki points to use it again.

Cold Hearted

At level 11, your Way of Lin Kuei features ignore resistance to cold and treats immunity to cold as resistance. You also gain resistance to cold damage.

Fatality

At level 17, if an enemy fails their saving throw against your Freeze feature and are reduced to 20 hit points or less, they shatter and die. Creatures killed in this way can only revived with True Resurrection or Wish. Additionally, creatures within 10 feet must make a dexterity saving throw or take damage equal to two rolls of your martial arts die.