Altar Emitter

The Altar Emitter is the answer to the first stage of automating the Blood Altar. This block can be set to check the Blood Altar for a given amount of life essence, and emits a redstone signal when said amount is reached or passed. The required amount can be modified by right-clicking (+100), or shift right-clicking (-100). To work correctly, the Altar Emitter needs to be placed in one of the four spots it is in the picture below. A tooltip was added for ingame remembrance.