Guild Wars 2 Walkthrough Part 7 – Wayfarer's Foothills, Assist Grimarr Molesmasher

Molesmasher: “So you want to fight the dredge, eh? Then listen up. I'll tell you how to kick those moles in the comrades!”
Hero: “Sounds Effective, Tell me what to do.”
Molesmasher: “Break their machinery and their turrets. And if you run into any security officers, take them out and steal their defense plans.
Hero: “Sounds simple enough. Here I go!”

If you have some security plans:
Hero: “Do you have any interest in these blueprints that I found?”
Molesmasher: “Interesting. This is why I never write anything down! We'll put these plans to good use.”

Head down the slope and into the mine that is just to the West of Molesmasher. Destroy checkpoints wherever you find them. Loot the bodies of the fallen for defense plans. Once the Hero has most of a bar, head back up to the surface and talk with Molesmasher again. He will be grateful to receive the plans and they give a handy boost to your progress bar as well.

When you complete helping Molesmasher you receive the following letter:
“Those dredge have had the fear of norn beat into them! Love it! Come by and visit some time. No great deed should go unrewarded! - Grimarr Molesmasher (56 copper)

Return to Grimarr Molesmasher after receiving that letter and your hero can collect Karma Rewards:
Dented Dredge Gear (91 karma): +3 Power – Fine Accessory: Lvl 5
Heavy Molesmasher Gloves(63 karma): Defense: 19, +2 Power: Fine, Heavy Hand Armor, Lvl. 5
Cloth Molesmasher Golves (63 karma): Defense: 14, +2 power: Fine, Light Hand Armor, Lvl. 5
Leather Molesmasher Golves (63 karma): Defense: 16, +2 power: Fine, Light Hand Armor, Lvl. 5
Molesmasher (70 karma): Weapon Strength:146-165. Fine Mace, Lvl. 5

Surrounding events:
Stop Dredge from repairing their tower.
Dredge remaining
Tower Repair progress

This is a simple event that will likely trigger as the hero makes their way down into the depths of the the tunnels. The thing is, to participate in the events, the Hero must return to the surface and engage 5 waves of Dredge repairmen that are attempting to bring the Tower in front of their lair back into working condition. Just join with other fighters and keep each other alive. This is a simple endurance event that does not cause much trouble.

Defeat the Svanir Dragon Shaman
He appears on the lefdge just to the Southwest of Molesmasher. Just join with others fighting him. There are a few Area of Effect spells that he has. Just keep that in mind and move whenever a circle randomly appears beneath you. That will ensure your survival.