Looks like we are getting an option to practice fights in a dungeon or raid as a part of the heavensward updates. This made me think, "Could we get a boss attack mode?" Like a Colosseum mode (FFVII) I would love that! Either Solo, Duo, 4 man, 8 man, or 24 man. Even if it was just solo/duo to start, it would be so much fun to have a ladder ranking on how far you get with constant streams of enemies that get increasingly harder.
SourceQuote:
The specifications are already planned for the "practice mode" for raid dungeons. However, the implementation won't be simultaneous with the release of the raid dungeon itself, it will be a little behind. (Yoshida)