Blood Sigil

"It's a blood sigil. Blood leads to blood. Or their next of kin."

- Henry explaining the spell to his grandsons about the Blood Sigil.

The Blood Sigil is a powerful magic symbol that allows a user to be sent to their kin, regardless of differences in both time and space. This was used by Henry Winchester to both locate his son John and escape the Knight of Hell Abaddon. However, he was inadvertently sent to Sam and Dean Winchester, his own grandsons, due to John's deceased state.

This was a powerful enchantment that tapped on the power of the user's soul. According to Henry, knowledge of this sigil is expected from high-level Men of Letters.

History
In 1958, when fleeing from Abaddon, Henry Winchester used the Blood Sigil to try to reach his son John in the future but as he was dead by 2013, ended up with his grandsons Sam and Dean Winchester instead. Abaddon somehow managed to follow Henry through time with the same spell.

In 2014, in order to blackmail Crowley into helping her kill the Winchesters, Abaddon used the Blood Sigil to travel back in time to 1723 Scotland to capture Gavin MacLeod, Crowley's son. She was then able to use the sigil to return to 2014 with Gavin. In this instance, Abaddon used a bottle of what was presumably Crowley's blood to create the sigil.

Procedure
The Blood Sigil is rather difficult as it required the power of the human soul. However, as demons are able to use the spell without having souls or needing a recharge time, more powerful beings also appear to be able to use the spell to travel through time on their sheer power alone. Additionally, the other ingredients are very rare and belong to powerful creatures.

Ingredients
The Blood Sigil required blood of the caster, angel feather, tears of a dragon and a pinch of the sands of time. The blood is used to draw the namesake sigil on any flat surface.

Incantation
Like most spells, the Blood Sigil has an incantation. This chant to activate and invokes the magic of the symbol, is in Enochian. The incantation is as follows:

"CNILA PVGO CNILA": "'Kah-nee-lah puh-goh kah-nee-lah" ("Blood unto blood")

The user must recite this several times until the sigil glows and the spell is activated.

Trivia

 * The Blood SIgil could either be performed or the effect replicated by powerful demons, as Abaddon was able to follow Henry, despite her not being related to Sam and Dean.
 * It has been shown that the spell can be used to travel both ways in time depending on where the relative one wishes find is located.