Zombies are found in many dark and gloomy areas in Runescape.
In the Varrock sewers, near the level 14 Scorpions, there are crumbled walls that will protect you while ranging or maging. Since the max hit is relatively low, Zybez suggests that you fight with melee. Wearing any type of armour should protect you from the zombie's hits.
Dead man walking.
Zombie champion Scroll
Bones (100%), Coins (4-13), Body rune (6), Air rune (13), Cosmic rune, Nature rune (6), Copper ore, Bronze longsword, Bronze med helm, Fishing bait, Iron arrow (5), Grimy herbs, Eye of newt, Mithril arrow, Mind rune (5)