RaiderIO seems to have it covered
If right, seems all healing debuffs should be working on this boss, doubt they would overlook something like this if it was not intended.We have a new theory that makes a lot of sense when it comes to the Jailer health "changes", as we got word from a mysterious stranger on discord that could explain everything. It seems the Jailer's healing the whole time was 20% lower due to Warlock's Felguards having a minor MS effect - Legion Strike. So we never really saw the Jailer fully healing, and the recent changes were the difference between the 20% we always saw and the full 50% of an Arms Warrior's Mortal Strike.
And so the 24.4% was WITH the 20% Warlock debuff. while the current 19% is with the Arms MS one.