Game Mechanics: Q: How do DoTs Work Here?

[Loretta]

Q: How do DoTs Work Here?

I remember hearing/reading that the DoT spells will overwrite one another. But I want to confirm if this is true or false.

In these situations, having more than a couple of necro's rreally wouldnt do much for a raid (except providing more mana for healers). I know Necros have mana funneling and other uses in high level raids -

Anyway, I have been considering rerolling as a different caster if this is the case. I havent really been too active here but I like my necromancer, it's just that it feels a bit futile if she wouldnt really be useful in raids with more than 1 necro present.

Just looking for some opinions / advice. Has anyone specifically not rolled a DoT class because of the classic DoT mechanics in groups/raids?

-Loretta