Constant spells/ Skills do not last the full duration! and cancel each other out

[DemonMonger]

There is a serious problem...

If 5 mages cast lightning on a hyena at the same time and no one has a spell fail only one lightning does full damage. Same with ice blast and many other spells. Please fix the spells so if 1 is casted it works for the full duration no matter what other spells are cast on the enemy.

example:

Given
ice blast damage = 30 40 30 40 50 30 40 30 40 50
lightning damage = 150 150 150 150 150

Problem A
if mage 1 cast ice blast then mage 2 casts ice blast at the same time then

iceblast mage 1 = 30 40
iceblast mage 2 = 30 40 30 40 50 30 40 30 40 50

mage 1 didnt get full damage

Problem B
if mage 1 casts lightning and mage 2 cast lightning at the same time

lightning mage 1 = 150
lightning mage 2 = 150 150 150 150 150

mage 1 didnt get full damage or xp!

NGD please fix the spells so they work for the full duration thank you!