My guess is that the Decreipify will activate 20% of the time...but seriously since it's lvl 15 Decreipify it should last a while so enemies should be decreipified all the time. An act 5 mercenary needs the same kind of armors as an act 2 one does...huge defence, resists, physical damage reduction, life leech...I think you're going to have trouble keeping him alive...Lawbringer, even in an ethereal weapon isn't going to do a lot of damage=no leech=dead merc...The decreipify is going to ease things a bit, but he won't be a though tank.
as armor for barbmercs, a cheap alternative that does great is shaftstop: damage reduce, life...
Myself, i prefer the 'stone' runeword, for its massive def and great fhr (60%!)
Preferably in an eth armor, for def bonus.
If you have way too much runes, coh cant be wrong, but it seems like a waste to me...
I dont know how much damage the merc will reach with such a sword, but make sure you have lifesteal from the helm, or the merc will die anyway. Andys visage, or crown of thieves make exellent choices, even tals mask is great
As always, ethereal items is the way to go, unless you plan something really expensive. Yes, i know, some people make eth coh's just for the fun of it, but im not that rich :teeth: