Skin of Shadow - The Artist's way

Enter Scholomance, jump down on the left side, open the iron gate and go through then turn left. Enter the room with whelps and avoid them then jump down through the hole on the left side.
You are now in The Great Ossuary. Kill the Risen Constructs and Rattlegore and loot the Viewing Room Key from him. Follow the way back up, past the whelps back to the room you jumped into when you first entered the instance. You can easily avoid the group that's near the Viewing Room Door. Use the Viewing Room Key to open the door and go trough then turn left immediately, open the Iron Gate, follow the path down to Headmaster's Study, go down the stairs turn left and enter the room then kill the Risen Bonewarders and Lady Illucia Barov. Take off your gear, run to a random room and die, run back in, reset & repeat.

This route usually takes around 4 minutes to complete and you have a better chance of obtaining more Skin of shadow this way.

Btw thanks for the awesome guide, I couldn't have done it without you :)

Just added this to the site. Thanks again, let me know if you have anything else to add...

Thanks,
Cogsworth