New Mob Idea, Grimmites

With the new snapshot, I think there should be more hazards deeper down with the higher abundance of diamonds. One such hazard is this mob I saw people discussing on a YouTube thread, and decided to add some of my own ideas to it. The Grimmite would be a silverfish like mob that can spawn either when you mine infested grimstone or if you mine diamonds/ores near the infested block. The spawn rate for the infested grimstone should be toned down in comparison with silverfish as to not be a constant annoyance. After emerging from a block, it would look similar to the silverfish having a long and narrow insect-like/rocky body. Unlike the silverfish however, it would be slightly bigger than a spider and be able to "burrow" through stone similar to how vexes can move through blocks. I think it should have 25-30 hp and a little more damage than most basic mobs such as zombies or skeletons. This would also make bane of arthropods slightly more useful as most insect mobs are not that difficult to kill.