The Master tone plugin for DaVinci Resolve helps shape the image with much greater control of the tonal range than Resolves built-in grading controls. It basically mimics Nuke's ColorCorrect node, which separate Lift/Gamma/Gain operators for shadows/mids/highlights and is developed to better reach what's known as the "film contrast"This is your secret sauce to achieve the rich and bold contrast known from film.
Master Tone offers the intuitive operation of lift, gamma, and gain, combined with granular control over the tonal area of the image where the adjustment takes effect. Too often colorists are forced to choose between control and ease of use — Master Tone offers both.
In this video Cullen Kelly walks you through the key features of Master Tone.