I tried that twice and it didn't work. Way too many mobs on my tank.

The only "trick" that i use on Skadi is to wall hug the right side (of the chain "fence"). You will never be hit from the Dragon's frost. Just slowly work your way up, making sure to redrop totems after you've gone around the pillars.

Save up all 5 harpoons before you fire them, just let the spear guys spawn and run to you. When he's in range fire them all (you may have to move to different spearguns to do it faster). Skadi is ridiculously easy.

Oh, and kill the Caster mobs ASAP (IIRC, they have a glowing heart), they will eat up groundings in a few seconds and they hurt like hell.