Shinobi

Lv6: You can make dexterity checks and hide on a Reaction -- Add proficiency to all stealth attacks*²
Lv7: You gain advantage of damage rolls--You can make a Stealth attack deal max damage once per short rest
Lv8: Your reactions are replaced with Preaction*¹-- Gain an additional Reaction on your turn
Lv9:
Lv10:
Lv11:
Lv12:
Lv13:
Lv14:
Lv15: AMPLIFY
Lv16: +8 to Stats + New Proficiency
Lv17:
Lv18:
Lv19:
Lv20:
  *¹Preactions are similar to reactions but they take total priority and and can not be reacted to
*²Stealth attacks are attacks that you make on a creature that can't see you. You have advantage on all Stealth attacks