Silverpaw  

This is a triggered spawn. To spawn him, and you must be on the quest Of Fire and Ice: Band of the Frost Maiden, inspect a pile of rubble at 1365,384,-792 Copy .

This encounter can be solo'd by an alert wizard. Target the a pile of rubble but move as far left as you can before inspecting it. Silverpaw will spawn to the right, hopefully out of agro range. Now root and nuke, emphasis on the root part. If it breaks and he reaches you, you are dead.

He hits for 3500-4300 crushing.