It is very likely that a Sorceress will be killed at least several times while dueling Duriel. As such, any item worn proves virtually useless, since they are lost once the player dies until the corpse is reclaimed. This strategy is for Sorceresses on levels 21 or above, by which time she should have several points in Fire Wall and one in Teleport. Upon reentering the Chamber, the Sorceress may like to reclaim her corpse before turning to Duriel again, especially if she was holding any staff that boosted Fire Wall. Continue the casting Fire Wall and Teleport until Duriel is finally killed.