If you have ancients, use ice spells against the melee brothers. That way, you can simply freeze the brother and retreat. This way, you can turn off your prayer and attack the brother safely for a while. (Take into account how long your ice spell freezes for. Ice rush freezes for 5 seconds, burst for 10, blitz for 15, barrage for 20.) Make sure you still bring a melee weapon for Karil and Ahrim though. I usually bring a ddp++ (for special) and a whip.
Also, if you want to save prayer potions, wear strong melee armor if you're maging. Because the melee brothers are so weak to magic, it doesn't matter if your magic attack bonus is -50. This way, you should only need to pray against Dharok, Ahrim, Karil, and leave any extra for Verac. (Although Verac can hit through pray and armor, its doesn't hurt to use and remaining prayer on him.) Torag and Guthan can still hit you if you don't pray, but they do less damage and hit less often.
Next, I got is the best order to do the brothers in. Like others have probably said, the best kill order is Dharok, Karil, Ahrim, Verac, Torag, Guthan. Doing Dharok first basically eliminates the possibility of running out of prayer, making the kill much safer. Doing Karil next is so you still have prayer to use against him. The reason why you do Karil before Ahrim is because even with prayer on, Ahrim can still reduce your attack, defence, and mostly your strength. Ahrim is best done after Karil because for the last three kills you won't be using melee, making Ahrims stat reducing useless. Do Verac next, using any prayer you may have left over from Ahrim, then proceed to the next two brothers. It doesn't matter which of the two you kill first, but I personally prefer doing Torag first because his crypt is closer to Verac's. After killing Torag or Guthan, proceed to killing the other brother. ONLY BREAK THIS ORDER TO MAKE THE BROTHER IN THE TUNNELS LAST.
I'm running out of letters now, so that's my advise for now. Big_Bang5766 signing out.
05-Jan-2012 22:35:12