Description:

The Corruption Pulse is a placeable block that rapidly converts nearby grass within a 100‑block radius into corrupted ground — each converted grass block is randomly replaced with coarse dirt, dirt, gravel, or soul soil — and those corrupted positions permanently count as valid hostile‑mob spawn surfaces. While placed and with a player within ~128 blocks it will force‑spawn regular hostile mobs (Overworld and Nether types; Elder Guardian, Ender Dragon, Warden and Wither are excluded) in a 30‑block radius (no spawns closer than 24 blocks to a player), capped at 16 mobs and attempting up to three spawns every ~3 seconds; break the Pulse to stop further spreading and forced spawning, and leave clear ground and headroom nearby if you want larger mobs to actually appear. For atmosphere, a subtle Wither‑like corruption ambience now plays intermittently (checked ~every 5 seconds with a ~25% chance when a non‑spectator player is within ~64 blocks) but it only affects sound.