I was on Agrarian Skies 3 and as I was playing I made a Mariculture magnet. I killed a cow with it and when I clicked with it it literally killed me 43 times. I lost ALL of my lives. During this entire thing we were working on getting cursed earth and since the magnet killed me so many times it said it was game over and we had to keep reconnecting to AG3 in order to get our stuff from the cursed earth. Due to this entire glitch and mess up we lost very good tools from Tinkers along with a builders wand and two wireless ME controller things.
Don't use things from Blood Magic without sufficient blood essence. You have nobody but yourself to blame for those deaths.