Just as the title implies: a mod that add features from the current Minecraft version, 1.10, to a previous version, 1.8.9.
For those who will comment "Why would you need this, why not just update Minecraft?", it's so we can use our un-updated mods/modpacks while being able to enjoy the features of current Minecraft.
I have actually seen such a mod before,(Added 1.9 stuff to 1.7) but I do not remember it's name, and google searching is inconclusive.
Can anyone help me out?