Tavern of the Boars

There are two things you can do here: Kill the foreman of the damned, or complete Johnny the Arena Master's challenge.

First, the foreman of the damned:

Go to Bartender Ramgleg, and sayto him history. After telling you a brief story, he will ask you to consult Thigo, the Tavern Bouncer for caverns. Go sayto Thigo caverns and he will ask you to prove your worth by finding him a weapon made of ethereal energy. There is a hidden NPK room north of the bartender, where the skeletal warrior is. Kill him for his sabre and give it to Thigo. He will then ask you to talk to Delphina the master chef about gaining access to the caverns. Go talk to her, (she is in the far north room inside) and she will transfer you in. Go west, south and this is where the foreman of the damned is. He isn't too hard to kill, you can receive a mangled hardhat and some other equipment once you defeat him.

Second, the challenge of Johnny the arena master:

He is in the northwest side of the tavern, visit him and sayto him challenge. He will transfer you down. Prepare here and then go north into the LPK. Now depending on your class levels, you will encounter different mobs - five in total. If you manage to defeat them all, you will be rewarded with an orb and a small amount of practices. If you have all the 5 orbs from first, second, third, fourth and archon class, you may receive a valuable equipment.