With the Khitai expansion, there was 11 quests added to the old world (from lvl 25-75), these all give a eastern weapon as reward, if you do all of these quests a 12th quest will open up from Hwanung in Paikang himself, rewarding you with a relativly good blue lvl 80 weapon.
The rewards from the final quest are split up into archtypes:
List of the 11 quests is taken from AOC Forums, but since they will soon be deleted I've backed them up here:
Dan Sang Gum - Level 25 1HE 28.9 DPS ( 30-49 ) +15 Stength +12 Constitution Reward from: Nam Woo Gun , Wild Lands, eastern end of the northernmost west-east path on the map [881, 1128] Do Kki - Level 30 2HE 40.4 DPS ( 41-67 ) +35 Strength +25 Constitution +100 Stamina Reward from: Choi Chul Ho ,Tesso, Upstairs next to Gov. Myrtilos Kal Gum - Level 35 Dagger 25.7 DPS ( 24-42 ) +17 Constitution +21 Dexterity Reward from: Sim Hak-Gyu ,Tesso Docks Chang - Level 40 Staff 26.5 DPS ( 21-50 ) +20 Constitution +45 Magic Damage +16 Magic Mana Tap Rating Reward from: Konggee, Purple Lotus Swamp, 1099 1169 Gung Si - Level 45 Bow 52.4 DPS ( 58-99 ) +19 Constitution +31 Dexterity Reward from: Lee Ho-Chil, FOTD, Camp Taur Jang Gum - Level 50 1HE 51.9 DPS ( 54-88 ) +35 Strength +20 Constitution Reward from: Wren, Dinog, east of rez pad by gate Dang Pa - Level 55 Staff 33.9 DPS ( 27-64 ) +35 Constitution +300 Mana +60 Magic Damage +25 Hit Rating Reward from: Geo Boogi, Khemi, across from Trader's bazaar, near water Ji Pang-Ee - Level 60 2HB 72.6 DPS ( 84-111 ) +88 Strength +35 Constitution +225 Mana Reward from: Ung-Nye, Ymir's Pass, NW camp Wol Do - Level 65 Polearm 80.0 DPS ( 95-167 ) +100 Strength +45 Constitution Reward from: Hodong, Thunder River, near General Lupercus, 967,1546 Jang Ssang Gum - Level 70 1HE 70.3 DPS ( 74-119 ) +55 Strength +22 Constitution Reward from: Bae Man-Sik, Poitain, Just across the bridge, into the village Jang Ba - Level 75 Staff 43.8 DPS ( 35-83 ) +35 Constitution +75 Magic Damage +33 Hate Decrease Rating +30 Magic Life Tap Rating Reward from: Hong Gildong, Keshatta, top of stairs near rez pad, and next to Wayfarer of Asura