Cobblestone golem

Large, sentient gravestones with creeper faces, they may look menacing though they are completely peaceful to players. Their menacing looks are weaponized though... Small mobs will just run and some larger ones, including witches, skeletons, zombies, zombified piglins, and evokers. They will blow up if anything attacks its creator or it. The explosion causes no terrain damage, and it explodes into derpy little cobblestone fragments which hop around to assemble again. Cobblestone golems are shy by nature, they will hide if they see you mine cobblestone.