1. Have help, preferably an ice wizard and life wizard 2. ice dispels for his blizzards 3 if you are storm you will need a myth dispel so he will not remove your prism
He is one of the hardest bosses in the spiral in my opinion. Not only does he call minions, he calls myth minions so you can kiss your blades goodbye. He calls one minion every round and when he has 3, he starts hitting you with a high hit blizzard at the beginning of every round. I think, it's been a while since I've been in there, he will call 2 minions if you use a heal over time spell.
If you are trying to solo him and are not an ice wizard or have an ice amulet, you need to find as many 1 pip ice dispels (Melt) as you can or you will spend all your time dispeling him and healing.
you have to when he has 3 henchmen/minions kill them first cause till all them are gone he have a -90 shield and will have one till you break shield after they gone. the weaker he gets the stronger the henchmen, so beware.