Head on over to Amityville and go talk to Artix, Invite him as a friend, But clear your friend list first. Now Invite Artix as "Friend B"(thats important). No keep walking down the path to your right, At the very end there should be two ways to go, take the top path. Complete the quest. By the end of it you should have 'rescued' Artix, and he will join your party, You will now have two Artix in your Party. Now all you need is a Light pet and a good light weapon, Then you will have the perfect Party for fighting Dark things.
Requirements:
Level 17
Weapon: Shining Duo
Party: 2 artix (i will explain how)
Now, you can get Shining Duo by defeating the Werewolf in Crystal Lake quest! After you get the Shining Duo, go get the Artix in the Amityvale yard where he is fighting all the zombies( you got to put him in the party B). Then you do the "Well" quest where the Artix dog is. When you finish you will have 2 Artix in your party. Then go to Thursday and do the yaga Stone Circle quest and if you want kill all the Yaga Sisters or you can go directly to Goffy(if you want to grow up lvl fast then kill all sisters). When you get to Goofy equip the Shining Duo, make the 2 Artix do the Light attack. You must put defense in yourself because if you don`t, you can say bye. After you kill the Goofy i thing you get around like 200 gold and you get a weapon that can be selled in the Market right next to Thursday, for like 200-300 gold. I kept doing this and i got 200000 gold and i bought a Pridemaster i bought all the papers to the armours and i still could buy the Doom Weapon (axe). So if you have any doubt you know you can talk to me. I hope i helped.