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F/M vs F/M/T: A Fighter/Mage can theoretically reach the full potential of both classes, assuming there's enough experience in one playthrough for a full party. I rarely ever use backstabbing anyway, so Find Traps and Open Locks should cover my basic needs for a thief. I don't think it's worth sacrificing my character's progression (by making a F/M/T triple class) just for these two thief skills.Thief gives you far, far more than two thief skills. His HLA traps are among the strongest weapons available to any class and his UAI ability gives you a much better set of usable equipment than you'd otherwise have. At lower levels, pickpocket gives you whatever items you like from the Copper Coronet without slowing your march toward 15K gold. And at mid levels, perhaps your gameplay style doesn't mesh well with extensive scouting followed by a selective backstab, but if you just cast invisibility on yourself and charge with the rest of your party, you can still get backstab damage on the first attack which is often enough to defeat the target.