Siegmund is a overpowered boss..........
In general, he has 200% defense....
Never hit siegmund with your v when he's about to jump or right when he lands,because his defense will increase to 400% during those moments.Including his dash and his charge attack.
althought he's a dumb mother fucker so just lead him under the tower and go on the other side of the pillar, then scoot back as far as you can. he'll eventually get stuck on the top part of the tower when he does this, make sure to be a class that has abilities that can pierce through wall.