I'm just testing things with Lua.

I just tried to make safetydance like thing and this is what it became.
When the lightning spawns on the outer ring, the only safespot is the center circle.
When the lightning is in the center then only safe spot is outside the circle of the runes on the ground.
The lightning deals 5000 damage every second to any person within 25yd of the lightning.
I used the lightning thing because I couldn't find anyhing with a shorter range and alot of periodic damage. (less info)