Transference

Witnessed between 1871 and 1881 between Harry Potter and Rose Evans (Dursley) resulting in the latter gaining enough magic to be a mage.
   

The Transference of Lily Evans and James Potter (May 1871)


Before her death, Lily Evans transferred her magic to her young son, Harry Potter, in the hopes of protecting him from Voldemort. Realizing what his wife was doing, James Potter did the same, flooding his son with his own powerful magic and rendering him nearly invincible. The strength of the passive magic overworked Harry's organs, allowing his body to rebound the Killing Curse that Voldemort attempted to use on Harry, using up much of the transferred magic. As James' magic was more powerful and closer in composition to Harry's own natural magic, it was used up mostly first. What remained of the magic of Lily and James was too powerful for a three-year-old to handle, causing rapid bursts of magic to occur over the month following the attack.
  Traumatized by the event, Harry became emotionally attached to Rose Evans (Dursley), whom he was close in age with. Rose, being a blood relative to Lily and possessing a very small amount of natural magic herself, became a conduit for the transferred magic, eventually inheriting all of Lily Evans' magic from her cousin, rendering her a mage instead of a squib or medium. The remaining magic from James worked for years in Harry to fight off the Killing Curse, resulting in a completely accidental cultivation of powerful passive magic in the boy, as well as a lighting-strike scar on his wrist where the curse hit.

Effect

The seeping of magic from a source into a receptor. Transference commonly occurs between mages and magical artifacts, and can occur between handfasted mages betwixt one another. More rarely, transference can occur between mages and non-magical artifacts and Muggles.

Side/Secondary Effects

Can cause memory bleeding between originator and recipient
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