The best method is the Arch Dimmeran Gemword in 4 socket helm. You will have it as an oskill. You would be limited to using your main skills on the left mouse button.
If you are looking for an Elite set or Elite Unique you can do the base upgrade of the lower version of the unique or set and with three of them you can then do the change to a set or unique.
You can have multiple auras when equipped on your gear. You just can not have them on the same item. You can have two or more items with the same aura when equipped mod and they will stack except for the Holy Auras(Fire, Shock, Freeze). If more than one Holy Aura of the same type is equipped they will be treated separately and not added together to be a higher level. The adding up the levels for an Aura is only between the items on the character or the merc. If both the character and the merc has that aura then the one that has the highest level will be active. If the character or Merc has the Aura active as a skill and is then using an Aura when equipped the level would be whichever one is higher level.
Many Veteran ES players choose items that have Aura when Equipped mod on them. Especially summoners. Common Mercs for them is either the Act 2 Prayer Merc and the Act 2 Might Merc. There are few items/runewords that have an aura when equipped that get boosted from Prayer or Might.
One problem if you play multiplayer is that there is a crash that is called the Passive Stat bug. If you have over 27 passive stats it will cause a crash in multiplayer, most likely for the other player. Active Auras, Skill Masteries and skills that are passive make up a Passive Stat. Tsuru added some tricks to make it less likely to crash.
I did some testing for Tsuru a long time ago on the Passive Stats.
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Say you are looking for Achilles set gauntlets. You have 3 Unique gauntlets. You can use the unique gauntlets in the cube to make Achilles set belt.
The Elite items are harder to come by. Many veteran ES players will gamble/chit set/uniques in nightmare and base upgrade the item to the elite version if possible and then convert the item when they have 3 of them.
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There is a conversion recipe that converts 3 set/unique to a set/unique of the same type. Upgraded items will work as well. Some upgraded set items does not work.
+all skills work on mercs. +class or skill tree does not. Most passive oskills work. Skills that say only for a class can be used if merc has the skill by default or has the passive oskill.
I do not think the barb merc is considered a full barb.
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Decipher points. You can not get enough of them. I sometimes have problems finding the unique or set piece but have no problem finding the unique or set version.
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Venom: I am thinking a magic weapon would be the best bet unless you are using Poison Slash as main skill, then a rare would be the best. If using Poison Nova it would be better to us a wand and necro shield.
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It depends some mods can only appear at a certain level so it is best to use the reroll points then. Charms I like to wait until I am in the late 70's or early 80's. I hardly venture into Hell under level 80. I do a lot of farming in Nightmare to prepare for Hell. Preparation is the key to success.
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Also if you'll let me I would like to help with updating ES my modding skills are very advanced unless it cmes to upsizing the towns or anything! If so just e-mail me at ps_emo89@hotmail.com
Another place you can try is the d2mods.com site and go to the eastern sun forum. I do not know if Perfect Cell is looking for any help and if he does need it he will let you know. Likely he will have enough help if he wants. I have also offered my assistance and I think a few others have as well.
[edit]
We need more information on your character.
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On Strike and supporting Fallout 4 Mod Makers
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http://homepage3.nifty.com/miyoshino/es/es3gemw_n.htm
http://miyoshino.la.coocan.jp/eswiki/?Miscellaneous#r_base_upgrade
http://miyoshino.la.coocan.jp/eswiki/?Miscellaneous#r_rerolling_and_recycling
You can have multiple auras when equipped on your gear. You just can not have them on the same item. You can have two or more items with the same aura when equipped mod and they will stack except for the Holy Auras(Fire, Shock, Freeze). If more than one Holy Aura of the same type is equipped they will be treated separately and not added together to be a higher level. The adding up the levels for an Aura is only between the items on the character or the merc. If both the character and the merc has that aura then the one that has the highest level will be active. If the character or Merc has the Aura active as a skill and is then using an Aura when equipped the level would be whichever one is higher level.
Many Veteran ES players choose items that have Aura when Equipped mod on them. Especially summoners. Common Mercs for them is either the Act 2 Prayer Merc and the Act 2 Might Merc. There are few items/runewords that have an aura when equipped that get boosted from Prayer or Might.
One problem if you play multiplayer is that there is a crash that is called the Passive Stat bug. If you have over 27 passive stats it will cause a crash in multiplayer, most likely for the other player. Active Auras, Skill Masteries and skills that are passive make up a Passive Stat. Tsuru added some tricks to make it less likely to crash.
I did some testing for Tsuru a long time ago on the Passive Stats.
The Elite items are harder to come by. Many veteran ES players will gamble/chit set/uniques in nightmare and base upgrade the item to the elite version if possible and then convert the item when they have 3 of them.
+all skills work on mercs. +class or skill tree does not. Most passive oskills work. Skills that say only for a class can be used if merc has the skill by default or has the passive oskill.
I do not think the barb merc is considered a full barb.
What charactor level, what act you are in. What is your highest rune.
Another place you can try is the d2mods.com site and go to the eastern sun forum. I do not know if Perfect Cell is looking for any help and if he does need it he will let you know. Likely he will have enough help if he wants. I have also offered my assistance and I think a few others have as well.
[edit]
We need more information on your character.