Mobs That Spawn On Grimstone Are More Dangerous

The introduction of Grimstone and negative Y levels are exciting and all, but I found myself wondering about what this change contributes to gameplay. At best it’s just another decorative block to be used like Andesite or Blackstone and contributes to the eerie ambiance of the deepest caves, but in the end, will just clog up more inventory space. So I thought up a thematic way to make grimstone, and the negative Y caves more interesting.

My idea is to have Grimstone affect how and what kind of enemies can spawn. This can just increase the light-level that enemies can spawn in or even make said monster more dangerous. This could be done in multiple ways, such as contributing to local difficulty for mobs spawned on Grimstone, making them more hardy and heavier hitting; making rarer mobs able to spawn or less rare (charged creepers, skeletons and zombies with higher-grade equipment, jockeys, fire-arrow skeletons, etc.); and/or boost enemies further such as spawning with status effects, giving skeletons tipped arrows, etc. 

This could make the block more valuable for making mob farms and more fitting of the name Grimstone. The effect could be removed in its other crafted forms so that it doesn’t negatively effect builders just wanting to use it in builds and could be affected by the local density or depth of the Grimstone blocks being spawned on.