I cast the spell twice , was quite amusing
When you get blown up you take 64000 in damage

(and yes i saved the bodyparts ofcourse)
That time the spell was cast ontop of a playerowned house
The other time I only halfdied in a nice bang.
It was cast inside Wisp Dungeon
And well.. thats all the blackrock that was availble so havnt had a chance to try it a third time.
Amusing it is tho