[Breeziyo]

Damage over Time spells do not stack until Luclin.

http://everquest.allakhazam.com/hist...es-2002-2.html Source.

July 24, 2002

** Spell Stacking Changes **

We've made two changes to the way spells stack.

Damage Over Time (DoT) spells are spells that linger on the target
doing damage. Until today two different characters could not have the
same DoT spell on the same target. As long as one copy of the spell was
active any new version of the spell would not take hold. After today
the same DoT spell cast by different casters can affect the same target
at the same time. Also, if you cast a DoT spell on a target and you
already have that spell active on it, the spell will refresh. (Note: It
will not be possible to stack Lifeburn).