Hello, I'm Ethroe, and this is my first mod The Obsidian Guard! This is a small mod that adds a new item called the Obsidian Chunk which can be used to craft Obsidian tools such as obsidian swords, pickaxes, axes, shovels, hoes, and also Obsidian Armor (helmets, chestplates, leggings, and boots). This mod also adds its namesake, The Obsidian Guard, a rare mob which will follow you around, fighting enemies and wearing a really nice set of obsidian armor, if he/she is holding an obsidian sword. This mod is a work in progress and I will continue to update as well as post some more of my mods. If you come across any bugs please let me know in the comments and I will do my best to fix them.
This mod was made in MCreator (https://mcreator.pylo.co/)
I did my mod for 1.7.10 like you wanted and I also have the mcr file up to.