This tall and powerful demon is Mara, Lord of Illusions, mighty among dreamers. He is capable of creating intricately detailed illusions, so real that they are almost as deadly as the creatures they impersonate.
The Species, Background, and God choices are all mandatory. You must be worshipping one of the gods listed above before entering Lair, Orc, or Depths, unless this isn't possible in which case you must worship them as soon as you can. Don't use faded altars (except in challenges where you can choose any god), and don't do anything to lose your religion unless otherwise specified.
Don't use any short blades, two-handed weapons, or ranged weapons except nets and stones. Using and training unarmed combat is allowed.
Wear light armour (ER 4 or lower). Monstrous Demonspawn and those with the "sturdy frame" innate mutation can wear armour with ER 10 or lower. All must avoid casting Ice/Hydra/Statue/Dragon form.
Learn at least one of Shadow Creatures, Spellforged Servitor, Summon Greater Demon, or Haunt, castable at 10% fail or less without brilliance.
Conducts are worth +5 points each, to a maximum of half your score from milestones, rounded down. (So if you achieve 4 milestones (20 points) you can earn up to 10 points from conduct bonuses.) Please indicate which conducts you qualify for when you post your morgue. Small mistakes in following conducts will usually be forgiven.
Use a phantom mirror on Antaeus, then kill Antaeus before the duplicate expires. You must also see the duplicate at some point after Antaeus has been killed. (In case you use fog, etc.) If done correctly, Cocytus will still have an automatic annotation that Antaeus is present, even though you killed him. (Please no one fix/report this bug yet!)
edit: When I first posted the challenge, it was with Geryon, but I decided to make it harder. Games started by Friday at Noon GMT can still mirror and kill Geryon instead.
Reach Depths:5 before you enter a rune branch. Banishment doesn't count, but don't get the rune, and leave when you can.
Bonus challenges are worth one star each, similar to banners in Crawl tournaments. Please indicate challenges that you qualify for. Small mistakes will usually be forgiven.
The main way to score points. +5 points each, and can be done in any order. (You don't need to tell us which milestones you achieve.)