Re: Divine Sacrifice question
It's not even clear that these are multiplicative since they're redirect effects. They may be mutually exclusive. In other words, maybe only one Paladin's DS can take effect on any individual player when they take damage, regardless of how many paladins used it simultaneously.
Possible Example:
Paladins A, B, and C all cast DivSac
Player D takes damage, at first 30% gets redirected to A, up until A's DivSac redirect total maxes out (from all raid members)
Player D takes more damage, and 30% gets redirected to B, until B hits his limit
Player D takes yet more damage, and 30% of it gets redirected to C.
Note that this is all speculation though, I haven't done any testing of this myself, nor have I read any reports of such testing.