Whifflewharf Nimbleworth Expertise

They tell adventures that if an attack hits and it seems to do no damage or little effect, change tactics. Whifflewharf Nimbleworth will tell you that you're not trying hard enough or thinking outside of the box. Construct immune to poison damage, use the poison to instead clog the gears. Is the monster immune to slashing damage? Maybe you're just not hitting it at the correct angle. Fireball not hurting the fire demon, make it more powerful. You have taken the expert advice and started to think of ways to use tactics differently. 

Choose one damage type: creatures immune to that damage type now only have resistance to your attacks. Resistance creatures no longer have resistance to that type of damage from your attacks.