Linchpins

The Linchpins are the three objects of elemental order, opposed to the three Archdemons. The three Linchpins include The Tower, The Sphere, and the Cube. The Linchpins, existing as single objects across multiple planes and locations, hold the planes in relation to each other.

The Destruction of the Linchpins
If a Linchpin is destroyed, the area surrounding all of its locations becomes delocalized space, in which no organism can survive. The delocalized space extends to the edges of the other Linchpin's spheres of influence. Only an Archdemon or one empowered by Archdemons can destroy a Linchpin.

The Power of the Linchpins
Each Linchpin holds within it the ability to bestow it's power on a creature that makes it to the center. This power directly opposes the Archdemons, allowing for their potential capture or death. The more Linchpins bestow their power on a person, the greater that creature's power over the Archdemons.
 * 1) A creature imbued with the power of one Linchpin gains the ability to deal non-lethal damage to Archdemons and may permanently bind themselves and one willing or unconscious touched creature to a nearby Linchpin.  They also gain the ability to withstand delocalized space for one day.  This ability recovers after one day in unaffected space.  The creature ages half as fast.
 * 2) A creature imbued with the power of two Linchpins gains the ability to infuse themselves once per day with the ability to deal lethal damage to an Archdemon for a number of rounds equal to their highest ability score modifier.  The also gain the ability to withstand the delocalized space left behind by a destroyed Linchpin for one week at a time.  This ability recovers after a week in unaffected space.  The creature no longer ages.
 * 3) A creature imbued with the power of all three Linchpins can always deal lethal damage to an Archdemon, becomes immune to delocalized space, and may choose to become a Lynchpin, replacing one that was lost or bolstering the the planes.  The creature can only be slain by an Archdemon or one empowered by an Archdemon.