I was playing around with the mods earlier and i came across a spawn egg Called "Spectral Miner" So i was all "Hells yeah!" And i spawned it in, well, i don't wanna spoil it 4 u but you might have HIM under your house he causes blindness for 3 seconds and it stays, either find and eliminate him or move. ALSO he cannot be killed by anything except a Scythe, i used a livingmetal scythe and i killed him in about 7 hits. He spawns ectoplasam at death and to be safe, wear armor.