999s Instance - Boss mechanics

werewolves#6809

Can anyone give a list of the mechanics for each boss
State if the boss order is random or not
e.t.c.

If possible any videos in english (prefered) showing a run of the instance, even if there is no boss mechanic explaination in said vid,

veno
https://youtube.com/watch?v=ysPyyLQBbSc

archer
https://www.youtube.com/watch?v=er4eXBtskb0

bm
https://www.youtube.com/watch?v=P31GjnT5K-8

cleric
https://www.youtube.com/watch?v=5HTr9H2P9jk

Demon Seek soloing 1~5
https://www.youtube.com/watch?v=BQDsQAJ2PmE