Most of them are terribly weak because they tend to be both single-target damage and, worse, armor-sensitive cold damage. Hitting a lvl 24/28/30 monster with cold damage is not going to bother it much, unless it's a fire djinn.
There's a few that don't suck completely:
Dark Aura works nicely in dedicated build. Search for "Aura Bomber."
Death Nova is a staple of minion bombing builds.
Discord would be good, but it's outshone by necrosis in PvE and crippled by the long cast time in PvP.
Putrid bile does reasonable damage, but the recharge limits its DPS.
Putrid explosion does decent damage, but a minion is probably a better use for the corpse.
If you count damage over time as DD, then rotting flesh and well of suffering both have have damage potential, probably the best in the line. (Though signet of infection can usually replace rotting flesh.)
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