Demon Challenge 1
Trophy Collectors
"The Prince of Hell wish to test your skills at gathering coins without outside help."
Requirements: Demon as Base Faction, Reincarnation 2+, Hellfire Blast upgrade purchased.
Note: Drow can be used but not required.
Challenge: Collect 5000 Demon Coins without using Gem Power, Reincarnation Power, Researches or Excavations.
Effect: Reduce all Heritage costs, except for the Mercenary Badge, based on the percentage of trophies unlocked.
Formula: 1 - (current / max trophies)
Upgrade: Works with Demon
Tips 1: Either be very patient, or wait until R7 and use Elves bloodline (recommended).
Tips 2: Scrying for Faction coins, challenges and Ruby Power is okay.
Demon Challenge 2
Legendary Antics
"The Princes of Hell demand a tribute, unleash the beast by extorting every other faction in this realm. You should perform this task with haste, for they are well known for their impatience."
Requirements: Demon as Base Faction, Reincarnation 8+, Demon Bloodline.
Note: Drow can be used but not required.
Challenge: Have exactly 666 Royal Exchanges across all factions, with 0 Demon Exchanges, in under 666 seconds current playtime.
Effect: Increase max mana by 6.66% of your number of Halls of Legends.
Upgrade: Works with Fairy
Tip: High gem and low Excavations (relative). You will need 95 Royal Exchanges of 6 Factions and 96 Royal exchanges of the 7th Faction, Don't buy Demon exchanges. Drow's blackmail upgrade helps the challenge, and the exchanges don't have to be spread evenly.
Demon Challenge 3
Passage to Tartarus
"The Demon King has ordered you to prove your might to the entire realm."
Requirements: Demon as Base Faction, Reincarnation 18+, Demon Unique Building
Note: Drow can NOT be used unless you can get Drow's Unique Building at R28+.
Challenge: Have at least 2000 Halls of Legends and 333 Trophies.
Effect: Increase the production of all buildings by 0.1% per trophy you have unlocked.
Upgrade: Works with All
Tip: Use Goblin Bloodline, can be easily done around Uvg(e66) gems.
In-Game Challenge Final Reward
Hellfire Burst
Effect: Hellfire Blast also counts Evil spells cast in this reincarnation to increase its bonus.
Formula: (0.1 * x), where x is evil spells cast in this reincarnation.