How do you play your sorc?
Erratic / Tele spammer that relies on an Insight for merc?
Can deal with monster hoards without merc and the merc is for the Boss Kills as a Tank? (Reapers or Pride)
The above two are pretty much the obvious ones... Might Aura of course. Holy Freeze is only used if you aren't confident with Static in close or your Merc doesn't leach enough hit points during Boss combat (so have a Life Tap wand on switch, after all pre casts before boss kill).
Depends on your game play, not the merc... build a sorc that doesn't rely on a merc, then you are golden.
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EDIT: sorry, forgot about Infinity... now that is a great merc weapon ... but I believe D2:r has Sunder charms that help your sorc out for immunity?
I'm playing single player so I'm doing alot of chaos/baals. So yea it's tele static & alot onto the skellys but the skellys really slow the runs.
Items like infinity/COH are a long way off for now but g-face, insight and trech with might aura is good. I didn't really think to use might aura so the post has helped. Also the life tap buff helps when doing certain quests while building up the sorcy too but not really needed once you level up to the 90s.
Also for the record for ladder style runs or new char builds I had alot of success with tals helm, gladiators bane and eth bonehew with shael/amn. That got me to the end till I started to upgrade the merc.
Thx for the responses peeps.