Dots still cost the same as they do now, but right after the spell lands, the caster gets 80% of the mana spent, back.
Then each dot tick will cost the caster, mana-spent*0.8/#ticks-the-dot-has.
It's funny how you all see a monster in these two lines, and I see logic and simplicity.
I will reflect on this, try to find the monster.
My original post, contained all the side effects that I found in my "searching for the monster"; yet you all saw something clear as day...
Nwaij found it over complicated and that it was a make belive issue.
Emzur thought it made no sense, cause casting dots or any other spell, is essentially the same; and should there for stay the same.
Jmayzak belives its not about game mechanics, but about player skills (not to lose mana to casting dots - topic)
I just dont see it, to me these arguments are near non sense heh.