Guild Wars 2

New dungeons

Idea: Maybe use something along the Order of Whisper, Priory or Vigil to build a dungeon with its lore.

New Armor and Weapon

Idea: Fractal Armor. Unique lootable weapon from already existing dungeons (Rare skins). New legendary weapon.

New achievements that can be usefull In Game (Gw1 title track for instance)

Idea: For each achievement rank, you obtain a small bonus to damage against enemy from the specific dungeon.

Idea: An animation that can be displayed (/rank /zrank) for lets say, slaying 10k mob in a certain dungeon.

Opening up the map

Ring of fire, maguma jungle, elona.

Challenging content

Hard mode instances (taking as an example UW and Fow in Gw1)

Sorry for bad english