I don’t know of any mods for the End in 1.7.10, probably due to the End not receiving much attention until later minecraft versions. I see a mod names EndPlus but it seems to be all but vanished from the net as all the links I followed led to 404.
EDIT
Found one named Hardcore Ender Expansion. Never used it so I don’t know if it’s worth looking into or not, I’ll provide the curse link:
https://www.curseforge.com/minecraft/mc-mods/hardcore-ender-expansion