You can manipulate the luminescence of magic weapons.
Benefit(s): When wielding a magic weapon that sheds light or that features a luminescent quality, such as a flaming or brilliant energy weapon, you can deactivate that illumination as a swift action. You can reignite the illumination at any time as a free action. Any intrinsic magic properties that would force the weapon to shed light, such as the extra damage of a flaming weapon, do not function while the illumination is deactivated, and the “significant portion” of a brilliant energy weapon that is normally made of light ceases to exist.
If a weapon affected by this ability ever leaves your possession (for instance, if you drop the weapon or pass it to another creature), its illumination and related abilities instantly return.
Pathfinder Roleplaying Game Ultimate Intrigue © 2016, Paizo Inc.; Authors: Jesse Benner, John Bennett, Logan Bonner, Robert Brookes, Jason Bulmahn, Ross Byers, Robert N. Emerson, Amanda Hamon Kunz, Steven Helt, Thurston Hillman, Tim Hitchcock, Mikko Kallio, Rob McCreary, Jason Nelson, Tom Phillips, Stephen Radney-MacFarland, Thomas M. Reid, Alexander Riggs, David N. Ross, David Schwartz, Mark Seifter, Linda Zayas-Palmer.