Found this on Reddit.

Boss 1: A Musketeer Zombie. Lots of AOE and adds. Killing the added dogs and staying out of the AOE is a priority. I don't get how the stacking works… but being in the the AOE seems to get crystals on you that explode after a time. Probably the harder boss.

Boss 2: A Zu. As soon as battle starts, eggs spawn all around. When it says one is hatching, kill the lit egg or a high HP add hatches to annoy the group. The Zu will become angry and hit the DPS that killed the egg hard. Later 2 more eggs will try to hatch, then 3. After killing the 3, the Zu will be enraged and KILL the DPS that did it.

Boss 3: Tyrant… A TwinTania looking thing that adds some zombies, complete pushover.

End Boss: Siren. Her HP goes down fast, but adds and status effects she inflicts will slow you down. Took a few tries to figure her out.

She will try to charm a party member into attacking others… this seems to be if you are low on HP. She also hits with a healing debuff. Lunatic voice needs to be stunned.

She Will swoop up and appear at a side of the room, run to dodge or she will dive across the room and hit you. She will also try to mass charm when she appears in the center of the room, stand under her to dodge the charm AOE.

She spawns Zombies, storm privates and sergeants. The sergeants need to be killed ASAP or they will grab and freeze a party member. The privates can be AOEd with Siren.

She will also try to mass charm when she appears in the center of the room, stand under her to dodge the charm AOE.

Well, wish I would have read this last night lol I was having to drop aoe heals to top everybody off to get rid of the charm, this sounds easier :P Not that healing was too bad, but in the event everybody was running from the crawler zombies it was a little rough.

Edit: That zombie musketeer brawl was a lot of fun. The whole dungeon is just badass. Quality through and through.

Btw you can also stun her lunatic voice attack (the one that causes heals to be less potent).

Edit: Just saw that it was already mentioned lol

Yea…. So as a scholar topping off everyone was a bit hard but fun none the less XD