This resource pack does not change anything about vanilla. This changes the model and texture of two blocks in The Fifth World
The Fifth World is a mod by Nictogen which allows you to extract genes from mobs and use those genes to create your own custom, possibly deadly, superpowers.
The hitboxes don't line up unfortunately but I don't think I can change that. If that kind of thing bothers you I wouldn't recommend installing this resource pack.
Please include this in your modpacks and feel free to let me know in the project comments. You have permission to use this on any server but not to redistribute it.