Thats correct, thats a tic every 3 seconds. Not to mention that PIE modifies your drain and drain II, MP siphon, TP siphon, and is the stat that icreases magic accuracy and raises your magic resistance. IE increasses the chance of DoTs sticking and reduces the chance of landing nuke of any kind for 0. so if I cast my macro with all 9 dots/debuffs, poison II, bio II(which also debuffs and reduces targets damage output) dia II(which also debuffs and lowers enemies defence), drown II, choke II, burn II, frost II, rasp II, shock II, and reduces the mobs resestance to corisponding elmental affinaty.

so when I hit my macro I cast all 9 debuffs back to back and often have them all up at once. Meaning my next nuke is gonna hurt cause they are debuffed, as wel as doing alot of damage.

at 125 PIE (my standard) when all debuffs stick (not to mention piety mods how long they stick) I am ticking for:

Poison II - 68
Bio II - 42
Dia II - 42
Burn II - 38
choke II - 38
drown II - 38
frost II - 38
rasp II - 38
shock II - 38

Total = 380 dot every 3 seconds. for a total of 205 MP

scourge II or banish II = 44 MP so 5 cast of one, the other, or a combination of the 2. On mobs 10 levels over you, you often only hit for low 200 but not always. DoTs hit for the same amount reguardless of level difference.....so my level 20 MRD is garunteed a 350+ dot.

scourge/banish II we will average at 400 for argument sake. Thats 2000 damage in 30ish seconds for 220 MP.

Now lets break down damage with a dot accrediting cast time. Keep in mind as you are casting your DoT tic will grow

poison II - 68 damage in first 3 seconds
bio II - 110 DoT at 6 sec
Dia II - 152 DoT at 9 sec
Burn II - 190 dot at 12 sec
choke II - 208 dot a 15 sec
drown II - 242 dot at 18 sec
frost II - 280 dot at 21 sec
rasp II - 318 dot at 24 sec
shock II - 346 dot at 27 sec.

at 30 sec tic wil have 346 again
Total = 2260 and debuff to 6 elemental affinities, offence, and defence.