Here are the first 6 bosses being beat, some are with coop partners which helps a lot. Let me know if you need any pointers.
The Darkbeast Paarl I beat on my first try: https://www.youtube.com/watch?v=NEB7KyteJps
Bloodstarved Beast: https://www.youtube.com/watch?v=krBtxp26o8I
Witch of Hemwick (2 bosses in 1): https://www.youtube.com/watch?v=Fglqy8Ik-mo
Vicar Amelia (2 coop partners, awesome): https://www.youtube.com/watch?v=fh6HmC-XBdI
Father G (First boss I beat): https://www.youtube.com/watch?v=cDO8BKWiakw
Cleric Beast: https://www.youtube.com/watch?v=gpvFYkerNow







