Word! I build a long distance swapper wand the idea was that i use the health pick ups in parallel worlds to boost my health. It was the budget deer swapper that uses lightning. Guess who was Dead on arrival?
I only use them if I am 100% sure they have no way of inflicting self-damage I see any self damaging spell on a wand and any sort of wacky modifier? I'll grab the wand if the stats are good, but it's going to wait until the next holy mountain to be actually used
It never happens to you, until the day comes when it finally does and it kills you and hours of playtime is lost and you just have to say "Of course. My fault." And you'll never want to do that again.
If you think you might touch the sludge, sprinkle some water to purify first (variants like brackish and chilly water, and even swamp work too). You can also convert water to concentrated mana by sprinkling a little cmana this way.