Originally Posted by
Zapathusara
first, you need to get Seal from another teammate (this is why a suggested a change in the post above).
So, in order to achv the fury insta kill, you need to Seal someone. Purple Rescuer, Prisioner or DM can do the trick. Then, with the enemy sealed, you get a guaranteed Doom (seal will change to doom). And finally, you unleash your fury... And pray, cuz there is a chance to kill (or not) the enemy by proccing Doom.
Freeze is the same. Got 3 debuffs? Sure ice cream.