Is there any trick to getting silver snake skins? I'm hunting in the Abyss in the eastern corner of the left half of the dungeon, just north of the bridge where there are maddening horrors. I'm getting quite a good swag of gems and venom, but no skins have dropped in several hours. Am I in the right area? Do I need to initiate some quest or other to receive the drop? Or is the true maddening horror the rarity of these skins?