you can only get new armor when there are new events
on the adventure quest worlds wiki
From quests, shops and events.
The DoomKnight armor is only available in Adventure Quest if you use the code you obtained by buying the shadowscythe t-shirt
You need to do the Destroyer part 3 quest to fight War Armor
Become a guardian
computer
you cant...
There is a cape that gives the quest for the set...
you have to have verified either a upgraded : dragon fable,mechquest and adventure quest accounts
Go to the shop
corner486
citadel