Mistwalker

Mist:
Mistwalkers start with 2 mist points on level 1 and receive 1 mist point per level except for level 20, to a total of 20 mist points at level 20.
Mist points are recharged upon completing a short or long rest. (Maybe an idea to slightly nerf is: after short rest gain 'insert dice' + proficiency bonus after short rest.)
lvl 1 through 5 is 1d4, 6 through 10 is 1d6, 10 through 15 is 2d4 and 16 through 20 is 2d6)

• Level 1 spells cost 1 mist point
• Level 2 spells cost 2 mist points
• level 3 spells cost 3 mist points
• etc.

Your spellcasting ability is Wisdom.

proficiencies

• Darts (and other small throwables)
• Daggers
• Shortswords
• Longswords
• Shortbows
• Light Armor
• Thieves Tools

Saving throws dexterity and charisma

Skills: Choose 2

• Acrobatics
• Sleight of Hand
• Stealth
• History
• Investigation
• Nature
• Insight
• Perception
• Deception

Class Features

Darkvision: 60ft, any other source of darkvision adds the full distance. A third source adds as normal.

Mistwhisper: You can whisper to someone or multiple creatures without anyone else hearing, while you and they are in or within 10ft of uninterrupted mist.

The Raven Queen's Gift:

• lvl 1
  Turn into a level 1 raven using an action and 1 mist point.
  Raven hp is 10 + Mistwalker level + proficiency bonus.
  Ac is 10 + Raven's Dex modifier + Wis modifier.
  Str is 10
  Dex is 14
  Con is 10
  Wis, Int and Cha are taken from Mistwalker stats.
  Is not targeted or hindered by ground based effects or damage and cannot be blinded.
  The raven can:
  • Fly 40ft.
  • Use help, hide, dash and disengage as a bonus action.
  • Attack 1 target for 1d4 plus dex modifier.
  • Blind 1 target with no saving throw for 2 turns as an attack action with 1d4 plus dex modifier for the cost of 1 mist point.
  • Any active self/buff type spells, concentration or otherwise remain active when changing into raven form.
 

Read the rest of the abilities and custom spells here: Mistwalker - full description