1 skill you will need to save your !@#:
BUT FIST OF JUSTICE IS FASTER CD and you can stun lock!!
Repentance has longer CC duration and is spammable provided the CD is up.
After 100 tries and wiping with messing around glyphs / talent trees, Repentance with any misc. tree will get it done.
1.) Deny Casting of Images
2.) Pacify Wrathion while you deal with the blood spawns
3.) Make everything easier
You can do brute force flask/food/pots and beast it sure, but this is more for the LFR geared/undergeared who don't do ToT norm or Heroic or have Tforged gear.
Cast Repentance when:
1.) Bloods spawn - so you can get rid of them before Wrathion casts anything to hinder you
2.) Wrathion begins to spawn images - you can essentially chain Hammer of Justice with Repentance for good effect.
3.) Wrathion begins to spawn images AND Blood trash spawns.
Repentance is spammable, provided the CD is up, and you can keep Wrathion perma locked till ur comfortable with your current situation; i.e. Blood Trash Down, you're healed up, etc.