for raiders, there just isn't a better cost-benefit option. natural flying, stealth, etherealness, fear10, high MR. slap on luck and antimagic and there isn't a PD that stands a chance, and they will be pretty much immune to mindhunts ect ect. you get all that for 20 D and 6 S.
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Since they have 0 encumbrance, is it worth also tossing on blacksteel armor, to deal with magic weapons or that 1 in 4 shots that get through the ethereal?