Well there is a method that involved PTR, but the time for that has passed. However, you can now go to DoomWood and obtain it in 1 of 2 ways.
1. Complete story quests up until you reach Zorbak's hut then buy it from him for 2,000 AC.
2. You can continue further in the quests and complete the sidequests for the Tower of Necromancy, after you complete the minigame you will unlock a merge shop hosted by Sally (yes THAT Sally, from DragonFable) there you can combine the Creature Shard (dropped by the Creature Creation mini-boss you will have to defeat to get to Zorbak) and the NUE Necronomicon( purchased from Lady Speedstyk's Rep Shop in Lightguard) to unlock the class for 50,000 gold.
Notes:
Both forms of the class are available to non-members.
The NUE Necronomicon costs 999 gold at the Rep Shop and is only available to players with Rank 10 DoomWood Reputation. (100,000 Rep)
I recommend using BotQuest Worlds ver. 1.7 by DataPaw Wolf for rep farming, as the number of repeatable rep quests is small and farming can become very tiresome.
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You can get Necromancer class at the "Necro Tower" (/join necrotower). Go up the tower and talk to NPC Sally. She will have the shop to buy Necromancer.
Just go too ptr and do all the quests until there will appear down there "Necromancer Class" then you click yes and there you have it.
You must hve necromancer class and must not be in the ptr server.
Necromancer class has gone rare on aqworlds. It was only available for a short time during the ptr testing on the ptr server. It doesnt even exist anymore. THose who had it lost it and got the guardian shadow cloak in its place. aiden runeblade
You get Paladin class in AQWorlds from Artix in Swordhaven (he is found in the inn).