Rune of Channeling

Description (Talon)
This rune will transfer the next spell you cast through your blade. The effectiveness varies by technique; anything relying on explosions will disrupt the path of your blade and lose some force, as well as dampening your strike, for instance, and attacks involving solid material will either be disrupted by the strike of your blade or will likely get in the way of the blade and - again - dampen its impact

Reference
Chapter 137 "William Shakespeare"