Can cast ice attacks that can Freeze you for a period of time.
Has an ice rain spell that rains ice from above, hindering your Movement Speed.
Creates ice spikes on the ground that persist for a period of time, similar to the Elementalist's Frozen Spikes.
Combat Tips
Always take out these mobs first if you see them on a map or they will use their slowing ice skills to handicap you.
Try to keep your distance when they're casting a spell.
When an Ice Brethren Shaman holds his staff out above him and waves it around, he's going to cast ice rain. Run out of the area as fast as possible, or knock him out as fast as possible.