Necro, how do you not choose Iksar?

[Daldaen]

The use in regen items is that you don't have to waste time in clicking heal items and you don't need targets to click heal items, increasing twitch efficiency or damage efficiency. I'm fairly sure the soul well staff blocks Splurt (our most efficient DoT) also.

The DPS from life drains help but they aren't efficient. Their resistance is a factor but most any mob a Necro will be soloing, will not be resistant enough to warrant sacrificing half the efficiency for the more reliable spell landing.

It does have to constantly tick down. That's how the spell works. If it doesn't you're clicking it off, losing mana regen, and wasting time rememing and recasting the spell. Again, inefficient and tedious.

See above about resistances, almost never solo are there resistant mobs that make the efficiency of a life drain greater than a resistable DoT. In high end group locations, like Velious or Juggs in Sebilis, mobs generally live long enough for 1-2min DoTs unless you have charmed pets. It would depend on the group makeup I think.

Good point on solo Necro charming. A better example would've been fear kiting or root rotting where you are using DoTs exclusively.