Collective

A Collective is the name given to the connection born when a large number of beings magically mix their powers together. While this name could also mean the connection between multiple numbers of beings, it is generally meant for groups containing six or more, as for the Power of Two, Three, Four & Five being the terms used for smaller groups. Several beings have been seen and known to take part in a collective, including the Avatars, Shadow Witches, Gods, the Zodiacs and the Titans. The demon Vicus also started a collective, by hiring magical children that he had turned evil.

Effects
The magical connection born in the makings of a collective ultimately binds the state of each member to all the others, which has a large variety of effects & uses, and can be both detrimental and beneficial.

The most prominent effect is that each member in a collective shares their magical power through this link, so that each member is only as strong as the total of all their magical powers interlocked. The more magical power that is poured into a collective (either through adding new members or by existing members gaining new powers) the stronger every member will become. However, the reversal of this is also true: the more magical power that is taken away from a collective (such as through secession or death of its members) the weaker every member will become.

Another limit to such power-brewing is that, while the single, magical powers of each collective member will be enhanced by the combined powers of the collective, members cannot formally use specific powers that belong to other members. For example, one cannot holster another member's power of Telepathy if they in their perspective lack that ability. Regardless, members of a collective are but plenty of times stronger than they would if they were alone.

The magical connection entwining each member of a collective can also allow contact through one another, even if they'd otherwise be isolated.

However, the bondage between the states of each member in a collective can be a disadvantage sometimes, as whatever occurs to one of the recruited parties has the possibility to affect the others. A good example of this was in a season 3 episode of Charmed, where in spite of only turning one of the Charmed Ones to the dark side with magic, the other two soon followed as the spell spread to them through their magical connection and in turn, their Book of Shadows became evil allowing a Dark Priestess to run off with it. Reversing the spell or curse placed on the collective would result in things going back to the way they normally were; however repercussions would still follow suit.