Well, I have some experiences with the dangers of magic...
A PC in a old Planescape Campaign killed the whole party. Not at the same time, but each time one.
1st, my Female cleric was dying(-5) and the elf fighter/ranger failed a easy savig and got enchanted by a strange monstaer( a flying monkey, IIRC), attacking the nearest person. the Wizard have no choice but use a fireball to neutralize the elf, but in the process killing all the enemies and my PC, who was at the spell´s border.
Ok, later she was raised.
Later, in a fight inside a burning church( playing Harbinger House adventure), the wizard fireballed the Bariaur fighter, but that was just because he didnt noted the wizard using the spell, and charged, positioning him exactly at the spell´s target.
Ok, he was raised later.
Then, we were in Ravenloft. The elf fighter ranger was charmed by some bad wolfs, and he started to see us as if we were wolfs too. He climbed a tree, and wasnt wnting to go down.
Then the wizard casted Magic Missile.
The spell didnt kill the elf!
But the 35 ft fall did.
Ok, we reincarnated him as a black bear...
Later in the near end of our cursed existence, We had a thoug fight with a hag. the cleric was dead, and the others badly wounded.
The wizard found a ring of wish. By this time he was affected with a Ravenloft curse, and his alignment was changing everyday.
That day was the time to CE change...
He choose to wish he was back home, but since planeshifting spells dont work in RL, the wish was wasted.
Well, in the following morning, 3 Yetis appeared ( thanks to a random encounter the DM rolled: he nedeed a 14 to something appear, and he got a 13...) and the whole party died. Including the wizard.

So we can say that the wizard killed the whole party, including himself.
I hate Ravenloft.