Creaking

A creaking is a hostile mob spawned by active creaking hearts at night. It moves to attack players with melee headbutts, but cannot move at all while any players in Survival or Adventure mode can see it. It is protected from all damage by the creaking heart that spawned it; breaking the creaking heart instantly kills the creaking. Hitting a protected creaking causes resin clumps to grow on pale oak logs near its linked creaking heart.

Creakings spawn when an activated creaking heart is triggered at nighttime. To activate the heart, it must be placed between two pale oak blocks (pale oak logs, pale oak wood, stripped pale oak logs, or stripped pale oak wood) with the same orientation as the heart and along the same axis (for example, all three oriented along the Y axis, stacked on top of each other). When these conditions are met and the creaking heart is within the Overworld, a creaking spawns within 16 blocks horizontally and 8 blocks vertically of the creaking heart. The spawned creaking is linked to this creaking heart. The creaking heart does not deactivate even if its surrounding logs are broken or moved via pistons when the creaking is out.

Unlike most monsters, a creaking can spawn on some blocks that prevent other mobs from spawning. Items that can be placed but do not have a collision box (buttons, glow lichen, levers, rails, redstone dust, pressure plates, torches and its variants) and full blocks that are transparent (glass, ice, scaffolding) that normally prevent mob spawns do not prevent creakings from spawning. However, blocks with a hitbox that is not a full block, such as carpets, do prevent creakings from spawning.