Newbie Guide:
At your current level, a Wooden Breastplate and a Hard Leather Pants set are an effective combination. Leather Shoes, a Wooden Helmet and gloves should be sought to complete your set.
Of course, you will not be able to equip all this equipment immediately at level 11, but you can start collecting them piece by piece, so they'll all be ready to equip when you reach level 15. It might also be a wise investment to start saving to purchase a Bone Breastplate at level 14 or 15.
Return