Here’s a couple of quick and useful reference sheets for the new rotation of Nightmare Dungeons in the Season of the Malignant.
SuppressiveFire put together all the relevant info for each dungeon, from the activities present in each section to the mob types (which is particularly useful for Elixir usage, as you can grab the appropriate damage boost before choosing which sigil to run).
There’s also a more complex spreadsheet version by Tyrannical1, which also covers the non-Seasonal dungeons, mob types related to specific item drops, Renown information, Glyph XP and monster levels by NMD tier and more. You can check that one out right here.
Hopefully these help you out when choosing which sigil to use – that is after you salvage those pesky Resource Drain, Backstab and Cold Enchanted affixes which are going away with the patch on August 8th!