Artificial Altar is a crafting station added by AlchemistNPC mod.

It acts just as a normal Altar would do, except it's craftable, don't spawn Hardmode ores on break and lets you move it around freely.

Ebonstone Block Ebonstone Block (50)
Rotten Chunk Rotten Chunk (15)
Battle Potion Battle Potion (5)
Thorns Potion Thorns Potion (5)
Deathweed Deathweed (10)
Ebonstone Block and Rotten Chunk can be replaced wiht their respective substitute if there is Crimson in your world.