orb/es build merc help hello fellow sorcerers, currently planning on making an orber sorc with energyshield. however im at odds with what merc and what weapon to get on the merc. does infinity break cold immunes if merc wears it assuming i got 37 pts on cold mastery? or is it better if i go for prayer merc with insight i believe? for fast life and mana reg. thanks in advance.