Reflective Overlap

Summary
The Reflective Overlap is a spell used by Merlin. He designed it in imitation of his fathers ability to summon Bloody Mary at will from a mirror. When the spell is cast against any reflective surface, Merlin is able to summon his own familiars. The familiars are physically as strong as a human with intelligence equivalent to a three year old, but they can be trained and will follow Merlin's bidding. The familiars have a special ability where the original can cast a spell on itself to multiply it into four of itself, similar to Tecumseh's Four Horse Engine. Merlin can summon up to four familiars, for sixteen once total after they have multiplied.

Uses
The reflective overlap was one of Merlin's most used spells, though he tried not to use it too much due to disliking having to interact with the familiars. Pre-Arthur, his familiars were one of his best ways to manipulate the events around him, using them to carry out all sorts of shady activities, essentially using them as goons or hitmen, as they were not intelligent enough to use for interaction with anybody he wanted to manipulate. The familiars can be buffed greatly by combining this spell with Invisible Chest Buster, Hand of Them as the extra arm is much stronger than a human arm.