I'm making a support barb to basically bo/hork behind people in chaos runs/baal runs.

Wondering what merc setup I should use?

Something to benefit everyone in a baal runs or something that can kill things solo so i can do trav runs solo?

depends om what your priority is, i guess. could go with A2 might merc and two setups. for team support i suggest making him an aura slave with items that noone of your team mates bring in: infy/conv or insight/medi or pride/conc for weapon. maybe that new one (flickering flame ?) in helm slot for cleansing, comes in really handy for Baal runs

a really can't think about a team that doesn't have a single insight merc or hdin for conc.
maybe infy at early ladder due to it's higher price, but that one is also quite standard.
to answer OP:
either way it will be your merc that will kill stuff, you have to decide if go more support oriented (a dual hoto barb with 105 fcr can easy be the teleporter) or more drop oriented with ist/lem swords.
dual grief is a watered down bo/hork

I don’t plan on teleporting and right now have isted Ali babas and am looking for two warcry sticks for swap

blessed aim merc