Limit breaks as tank?

[Cabalabob]

Ive heard it was 50% as well, but Ive also heard A12S ultimate is 240k dmg.
with a 20k crit aldo on our WAR tank, we take about 100 dmg or less with LB3.
w/o LB3, with 47k hp, and 20k crit aldo on, it still kills the WAR, rather than doing just 20k dmg.
(Me as DRK with 35k hp, and tank stance, i also die)

So im starting to think LB3 has been improved to be waaaay more than -50%, otherwise we could find a way to survive Alex ultimate w/o it.

The numbers are different all over the place cause it doesn't get enough use for anyone to figure it out properly. The originally accepted values for LB 1-2-3 were 10%-20%-50%.
But since then some say 20%-40%-80%. And any random variations in between those.
It's hard to test since it gets so little use, has no personal tooltip and isn't exactly something you can just go out and do to check the numbers.