Teslacoil mode to kill instantly any entity directly above it and only one. (not randomly and not in 8* cube)
How it's work:
Pressure plate
Any block
Teslacoil
If anyone step on pressure plate - instant death without item damage.
For what?
First - safe traps, it will be possible to make maze without risk of coil killing someone else.
Second - nice way to heal yourself at home.