Broa Damien Clear
I think we're the 2nd to clear in GMS. This was our 2nd real attempt with a full party but we did 2ish practice runs with 3-4 people.
Overall he's really not that difficult (despite what the end of the fight might make you think). As long as you properly manage marks and don't let him spawn 3+ swords it's fairly straightforward. Once you're at 3+ swords tho it's basically hell on earth.