This is Vantablack 2.0! I decided I didn't really enjoy the previous iteration of Vantablack, so I completely revamped the Vantablack texture pack. Most brick textures now connect together to add a sense of verticality to the way Bastions look. The color I decided to make blackstone is still desaturated to keep true to the original intent of Vantablack, but it's now a dark gray rather than a solid black, so hopefully it looks nicer and can blend better with deepslate and such.

The top of each brick texture looks like polished blackstone (assuming you use Optifine). If you want the default brick texture on top too, use two slabs.