From publisher blurb:
Blackdyrge's Bits & Pieces kicks off with Weapons of Synergy, 12 new weapon special abilities designed to augment and improve a PC's existing abilities. Although a synergy weapon special ability offers some minor enhancement to all wielders, its true powers are unlocked only by those with the correct feats or class features, allowing PCs to get more out of their magical weapons than just a bonus to attack and damage rolls.
Blackdyrge's Bits & Pieces - Weapons of Synergy contains 7 pages of new OGL material and includes the following 12 new "synergy" weapon special abilities:
Adroit
Deft
Disarming
Enraging
Feinting
Point Blank
Robust
Reactive
Relentless
Serpentstrike
Saddlescourge
Smiting
Also Included
An introduction by Blackdyrge.
3 fully detailed magic weapons highlighting select synergy weapon special abilities.