pjnow, Delirium is not required to manage Hell. Confuse isn't required either, though if you're only after that curse, there are considerably more accessible ways of getting it. I think Delirium might just be a tad too powerful after hearing various people report about it. An Ist rune for a helm which single-handedly gives you access to half of the Necromancers curse arsenal, not to mention +2 skills and a huge defense bonus?
In my mind, my dreams are real. No one's concerned about the way I feel.