
Add a mimic chest that looks exactly like a normal chest, but when you open it, it turns into a mob that attacks you

Make a wooden machine gun that shoots arrows. It should have recoil and shoot any type of arrow

Make a lightning rod and a lightning arrow that both strike lightning on hit

A shadow creeper with the same behavior as a normal creeper, but instead of exploding when close to the player, it vanishes and leaves a trail of smoke behind it without damaging the player.