Instant Kill Block

Instant Kill Block are blocks that can instantly kill entities in touch. Despite this, it is not instant due to damage when contacting with this block. At least before 1.0.5. In 1.0.0, It cannot be crafted, nor naturally spawned. In 1.0.1 and beyond, It is craftable. To craft, you need 4 Dead Skull, & 1 Redstone Block. After 1.0.5, It can instantly kill anyone even with the highest monster hp. DS = Dead Skull, & R = Redstone Block