FuryBand is one of the best 2d ascii RPGs that is out there today. Wander around a huge world, fighting through many dungeons. Find big and powerful weapons, and fight huge monsters. There are all sorts of classes, from warriors and mages, to more unique classes, like ninjas and hunters. You can play as humans, elves, and orcs or Maiar, dragons and golems.
Your quest is to go to Dol Guldur. After that, who knows what will happen next?