The Replication Spell is a mystical ability to conjure a perfect clone of oneself, either as decoy or minion which shares a link both with the original caster and the other copies.
A spellcaster conjures a perfect clone of themselves with no limit where the original and the clones shares a link on each other. Each duplicate could operates independently, regardless of what the others want them to do and each clone is indistinguishable from the others. This allows the user and the clone to do multiple tasks simultaneously or to cover a large area.
The drawback of this sorcerous technique is due to the link that is shared between the user and their clones. Had one of them, no matter the original or the replicate is hurt, all the others feel the same pain and if a clone is killed, the others are automatically killed as well, thus negating the ability to form an army of clones.
The known user of this enchantment is the Spider, one of the Drill Automatons.