The weapon in which you specialize has served you well, and in your time with it you've learned a few powerful tricks to help you turn the tide of battle. 

• Increase your STR or DEX by 1. 
• As long as you are wielding the weapon you specialize in, you gain additional effects:
• Every time your class would gain an Extra Attack, add one damage die of your weapon's damage type to all attacks made. (2d6 > 3d6, 1d12 > 2d12 and so forth.) 
• At the start of combat, choose one enemy you can see and make a DC 13 Knowledge roll. If you succeed, you ignore all resistances that enemy possesses that would reduce your Weapon damage output against them. Immunity is treated instead as Resistance that is not further affected by this roll. You can never reduce Immunity to anything less than Resistance in this way. Failure means nothing happens. You may make this Knowledge Roll against another enemy as a free action at the beginning of your turn if the current enemy you have studied is slain.