Monastic Tradition: Way of the Penumbra

Members of this tradition have found a connection between the mind and body, and the shadows of the Convergence. Monks have learned to tap into the shadows of Drellia through ki, allowing them to gain mastery over shadows, light, and shift into the border between them.
Inner Light Starting at 3rd level, when you take this tradition, you are able to use the light within you to keep you warm. So long as you are conscious, you are able to withstand freezing temperatures without cold weather gear.
Focused Penumbral Vision Also at 3rd level, you can channel your ki to heighten your other senses at the expense of your sight. As a bonus action, you can spend one ki point to gain 60 ft of Blindsight and 60 ft of Tremorsense and lose all other vision for 10 minutes. Using this ability requires Concentration.
Penumbral Arts At 6th level, your ki and your connection to the shadows of the Convergence allows you to duplicate the effects of some spells. By spending 2 ki points, you can cast misty step, darkness, and blur, and for 3 ki points you can cast clairvoyance and daylight. You still require the material components for the spells.
Cloak of Shadow and Light By 11th level, you have learned to become one with the shadows and unleash the light. When you are in an area of dim light or darkness, you can spend 4 ki points and use your action to become invisible. You remain invisible until you make an attack, cast a spell, or are in an area of bright light. Once you become visible, until the end of your next turn, the next creature that you hit with a melee attack (including an attack used to become visible) takes an additional 3d8 radiant damage and must make a Constitution saving throw or be blinded until the end of its next turn.
Mastery of the Ethereal Convergence When you reach 17th level, your connection to ki and the Convegence allows you to shift between planes. As an action, you can spend 9 ki points and effect yourself and up to five other willing creatures up to 10 ft away from you for the next hour as if you cast etherealness. Once you have used this feature, you can’t use it again until you finish a long rest.