Ghost Creeper & Ghost Dust

A ghost creeper appears and is visible only in the dark; it has a shimmering, translucent gray color, and its body consists only of a head and torso. It is found exclusively in the Pale Garden biome. A ghost creeper cannot be hit, and the only way to kill it is with a light source (torch, daylight, lava, etc), causing it to instantly vanish and drop a new item called “ghost dust.” With this, you can craft “ghost blocks,” available in all colors, which, when touched or stepped on, become hollow for 3 seconds, causing you to fall through them or unlocking passages. Or “ghost dynamite,” which appears and explodes (within 3 seconds, with a smaller blast than regular TNT) when a mob or another player approaches within its range. Or, by using ghost dust in a brewing stand, you can obtain the ghost potion, which makes you invulnerable in the dark until you approach a light source or strike a blow yourself.