Fehniix

http://m.imgur.com/a/BFYL1

HAHA! I do actually remember watching a series where somebody used that in the nether, and counteract it with another item to make black flames haha, that was hilarious!

Yeah admins and a senior mod came to help with water buckets but that only made it spread more ;-; we realized that the perdition imbued fire could counter it but it was already too late!