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.