Diffuse Mask

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The Diffuse Mask can apply a color transformation, like a hue shift or a contrast adjustment to the original color. This color transformation is encoded into a 3D texture called a colorwarp. This effect is then applied using a fresnel term, meaning it only appears around the edges of the character.​

See also

https://support.steampowered.com/kb/3081-QUXN-6209/dota-2-workshop-item-shader-masks#diffuse