snakes do more dmg have more hp, also he stack a dmg debuff on you, during the switch phase.

one thing that is good to know is that when you engage him again he will drop the blue beam on you, its nice to know since this was acctually what whiped me most times when i ran to from my team with the tank to bring him, i didnt dodge the blue beam that hit imidiately after reengaging.

thing that requires some traning is micro managing the chars u use to turn the switches, i jump dowm with my full team gather the snakes with the tank, place one char to turn the switch which takes 10 secs, while this happens i run to other side with rest of team dpsing snakes and making sure i have them all with me, turn the 2nd switch while running with 1st char to rest of group.

run up, dps snakes, drop a heal on team, engage boss, move imidiately to dodge blue beam rinse and reapeat 2 times.

dead boss.

its much like a dance, 1 2 3 4 dps boss dps boss dps boss 1 2 3 4 dps boss dps boss --- boss dead