as long you can get Andarial visage helm its worth for merc
HOWEVER…i would try for Ethereal Superior Sacred Armor for your merc if your going to make a FORTITUDE as you be spending an high rune after all…preferably a 15% superior but due to sacred armor drop rate rarity i think settling for at least 13% would be k
while i would not recommend this…CoH is also an option if your goal is to make a merc tank Uber Meph conviction aura(if your trying to have merc do Crushing Blow dmg to Ubers)
i would recommend trying cube formula to gamble for a 3 sockets outcome to make a Duress runeword in it…15% Crushing blow…33% open wound…and some resists…
alternatively to duress you could use a Duriel Shell for Cold Immunity and resists
due to Andarial Visage and Fort interaction…your merc will heal a lot since he be hitting like a truck
cost wise…Sorc will be cheaper than Barb for your merc(IF its a cold sorc)
as for character cost…Barb will require a lot more expensive gear to perform near sorc level for farming(Enigma,2X Griefs
Barb Merc gear requirement
Weapon: Ethereal Doom polearm(Holy Freeze Aura,heavy ias, high % Open Wound, 20% Deadly Strike, and high % dmg(330-370%)
Eth Fort Armor
Andarial Visage Helm…Ethereal if you find it
Blessed Aim Aura(to drasticly increase your hit chance)
Sorc Merc gear
Andarial Visage Helm…Ethereal if you find it
Eth Fort armor
Insight Runeword(if your a cold Sorc)…just snag a sunder charm to remove immunes
Infinity(Lightning or Fire Sorc)
Holy Freeze Aura for defense
EDIT: honestly…stick to your sorc…best farm option…i dont even think hammerdin could even compete vs blizz sorc as of time being if you got Death Fathom orb and a sunder charm…but just to give you insight
build specialities(if you dont own Infinity///Enigma runewords)
Blizz Sorc: MFing(Andy,Meph,Trav guys at Travincal&Dur 3, Pindleskin)
Lightning Sorc(Hell Rush, Keys farm(Terror,Hate,Destruction)
Hammerdin: lvling room carrier
Javazon(Charge Strike/Thunder Fury): Cows farming, boss wrecker(except Ubers)
Kicker Assassin & Smiter: Ubers killers(due to kickers nerf, Smiters are king again for it)
Hork Barb: High Rune farming at travincal(require fairly costy gear)…honestly i dont think the build worth it as they’re more limited in term of farm zone…Barb is more about liking the play style than the effectiveness
Blizz Sorc, Light Sorc and Hammerdin become about equal in term of farming speed once they got their high end pieces…
Chaos Sanctuary is a premium mf area but without nigma or infinity i would not recommend farming the place as you be met with at least 1 set of enemy immune to you…in hammerdin case they need teleport(although they run it anyway early ladder for lvling purpose)…in cold sorc case you might need sunder charm for here…if i remember correctly…infinity doesn’t break lord de seis cold immunity or even the non-elite caster like him
EDIT 2: well…Javazon could explode ubers…IF you dont die to the sunder charm taking away all of your lightning resistance XD(rather expensive as hell to cover that 1 downside)