target's target, casting bar

[Mirili]

I use Focus Target, if I need to see a bosses' move, or something. Closest thing to what you're looking for, I think. Can still "hard target" the player.

And, maybe I was just derping... but I seem to recall the default keybinding for Focus Target not working. Changed it to an unused button on the numpad, and that seemed to "fix" it. Assuming the problem wasn't me. >_>;