Time Rings

Time rings were objects created alongside The Hourglass of the Foretold time, but while it creates time for reality, Time Rings allow time travel. They look like single bands of worn material, with a jagged gemstone about half a centimeter across, that pulsates with light from within. There are only six Time Rings, each one with a name. Many have tried to destroy a time ring, but with no avail, except once, when The Ancients threw Tenoctli (opal, brighter than all the rest combined, made of polished, and varnashed wood (opposite to Duluph)(Ring of Air)) into Mt.Toba in indonesia, but the time energy that the action discharged caused the Toba supereruption, destroying Ancient society, and nearly wiping themselves out. It will take 5000 years of technological advancement to get back to that level. When
 * Chær: almost black gemstone, which is abnormaly large, and made of silver (opposite to Cryustnla)(Ring of Darkness)
 * Elpan: emerald, rather small gem, rather dim light, made of gold (opposite to Cthiric)(Ring of Life)
 * Cthiric: ruby, exceptionaly bright light, made of bronze (opposite to Elpan)(Ring of Fire)
 * Duluph: deep blue, no light, made of glass, when used transports user's soul to The Void, keeping the body intact (opposite to Tenoctli)(Ring of Water)
 * Cryustnla: diamond, made of cast-iron (opposite to Chær)(Ring of Light)

How to use one If you wish to bring a human, then that human will have to be wearing a Time Ring, but if the Time Rings are opposites, then the two participant's souls will be sucked into the Void, leaving the bodies intact.
 * 1) Put it on
 * 2) Say its name (they were named after their activations)
 * 3) At the same time, visualise the exact time you want to go
 * 4) You, and everything touching you, will be carried to that time.