I will never forget the day they took me sweet Helga from me. I wanted to kill them all! I couldn't catch enough of 'em on the edge of me axe! I couldn't catch enough of 'em in range of me Flamecannon! I couldn't see enough of 'em dead with the blasts from me Organ Guns!
So I built this here cannon. Biggest battery in all of Karak Anrok. What name would be more proper? Helga's the only name for this beauty!
Well, enough rememberin'. There are greenskins to crush! Why don't you make yourself a useful <career> and make sure the forge is spittin' out some munitions!
Particulars
Go to the forge in Mordrin's Anvil. Create a cannonball for the Helga Cannon.
To do so, collect coal from the bin near the cannons by right-clicking on it. Right-click on the Forge Hatch to deposit the coal inside, then interact with the Wheel Valve to pour the Molten Metal into the mold--again, by right-clicking.