Originally Posted by
huth
AFAIK, it increases the range of just about everything that has one. They even gave Guardian and Feral AoEs a range just so it can be increased.
This one is a bit complicated: The reduction applies to all damage(but no other) below 35%, including that of hits taken at more than 35% health.
So if the DK has more than 35% health, it first applies enough of that damage to bring him down to 35%, then reduces the remainder by 20% before application. If he's already at or below 35%, it just gets reduced.
That gives him an additional 8.75% effective health. Effectively a crappier Thick Hide.