Creeper

Creeper is Minecraft's iconic exploding mob: it approaches in complete silence, hisses once it is close, and detonates after a 1.5-second fuse, damaging players and destroying nearby blocks. That blast is why creepers matter beyond the danger — the gunpowder they drop is what TNT and firework rockets are made from.

The explosion can be beaten. A Creeper cancels its fuse if you get out of range before it goes off, so sprinting away stops the detonation, and a hit that knocks it far enough back can do the same. Creepers are also afraid of cats and ocelots and flee from them, which is why a cat by your base keeps them away, and why gunpowder-focused creeper farms use cats to push creepers toward the collection point.

Two rare collectibles come from creepers. A Creeper killed by a skeleton, stray, bogged, or parched drops a random music disc — the main way to collect most discs in survival. A Creeper head drops when a charged Creeper's explosion kills another creeper; the same mechanic is the only source of zombie and piglin heads.

Creepers spawn in the dark — on the surface at night and in caves — and there is no Creeper monster spawner in vanilla survival, so farms rely on dark spawning platforms. Unlike zombies and skeletons, creepers do not burn in sunlight, so a night's spawns remain a threat all day. When lightning strikes a Creeper it becomes a charged Creeper, with a far more powerful explosion and the head-dropping kills described above.