Time conduit

Time conduit was an incredibly rare, powerful chronomancy spell that allowed the creation of a very short-lived portal backwards through time.

Effects
It caused items that were anachronisms in the destination time to be removed, only restored to existence on the bearer's return to his or her own time. Pages from spellbooks or scrolls that referred to spells not yet in existence became blank, only being restored if the bearer traveled forward in time again. It was possible for the caster to decide upon the destination time and culture, and this could potentially create the other end of the portal at any rough location the caster chose.

The spell caused those traveling through the portal to age by one year, but their stay in the alternate time could not last more than thirty days. The portal would always take the time travelers to the first day of the destination year, and would always return them on the last day of the original year. Beings could not exist in two places at once on the timeline, so it was impossible to travel to the same destination time twice, and an attempt to do so would cause the spell to fail catastrophically.

Components
In order to cast the spell, the caster must possess the scales of three dragons of different alignments (one from each dragon is sufficient). He or she must also possess the dust from a dead time elemental, and some soil or stones from the destination time. The caster must also have researched the destination time to gain a thorough knowledge.