How to get death knight class

This how to get to the death knight class . What i do is once i can get paladin train the armor fully trained unless you don't have the dragon amulet once you train it continue with Artix's quests until you get extra credit you don't have to have to do this quest then just train necromencer then you can train death knight.
you train all of these classes by collecting undead slayer badges.

note: you cant get death knight until you fully train paladin and necromancer.