This table is to sort tier challenge rewards by Faction. When sorting, click on the arrow by "For" to list the reward effect by Vanilla and Neutral factions, (Prestige Factions only apply to themselves).
Key to Type & Base Abbreviations when sorting by about:
A: Assistant; B: Building; FC Faction Coins; MM: Max Mana; MP: Mana Produced; MR: Mana Regen; P: Production; Reduc: Cost Reduction
Sortable Table of Tier Challenge Rewards  

Faction  Tier  Name  Effect  About  For 
Fairy  1  Pixel Mischief  You gain a free assistant for every fairy upgrade you have.
Formula: $ x^{1.75} $ where x is amount of Fairy afflicted upgrades.  A  Fairy 
Fairy  2  Donations  Tax Collections gives 10 more seconds worth of coins and Faction Coins.  FC  Goblin 
Fairy  3  Enchanted Lands  Increase mana regeneration based on the amount of buildings you own.
Formula: $ (0.1 * x)^{2.25} $ where x is your Buildings Owned (This Game) stat.  MR  All 
Elf  1  Advanced Civilation  Reduces Elven Exchange cost multiplier. Reduces cost multiplier by 0.025; with no other reductions applying, the multiplier will be 1.075 instead of 1.1.  Reduc (RE)  Elf 
Elf  2  Light Collector  Increase Holy Light power by 10%.
PA: 0.96%  Spell  Angel 
Elf  3  Runic Coversion  Increase your mana regeneration by +0.85 m/s for every 100 Royal Exchanges purchased.  MR  All 
Angel  1  Efficient Magic  Reduce all spell costs by 10%.
(Calculated after Angel (2,3) Angelic Wisdom.)  Reduc (Spell)  Angel 
Angel  2  Mana Crypts  Increases maximum mana by 30%.  MM  Undead 
Angel  3  Nephilim's Blessing  Halls of Legends benefit from any Certificate, Validation, Affirmation or Proclamation upgrade. Also reduces Ascension penalty for Angel Bloodline.  P  All 
Goblin  1  Discount Season  Green Fingers Discount triggers every 8 minutes instead.  Coins  Goblin 
Goblin  2  Elite Warriors  25% of your purchased upgrades are added to your total trophy count towards Hellfire Blast and Hall of Legends purposes.  Trophies  Demon 
Goblin  3  Smuggled Jewels  Increase production bonus from Gems by 0.005% for each upgrade purchased.  P  All 
Undead  1  Deadly Impatience  Undead Heritage works 1000% faster.  A  Undead 
Undead  2  Experienced Helpers  Assistant production is increased by 10%. PA: 0.96%  P(A)  Elf 
Undead  3  Death Knights  Increase your amount of assistants by 10%.  A  All 
Demon  1  Trophy Collectors  Reduce all Heritages costs based on the percentage of trophies unlocked. (Except for the Mercenary badge.)  Reduc (Heritages)  Demon 
Demon  2  Legendary Antics  Increase max mana by 6.66% of your number of Halls of Legends.  MM  Fairy 
Demon  3  Passage To Tartarus  Increase the production of all buildings by 0.1% for each trophy you unlocked.  P(B)  All 
Titan  1  Rich Followers  You gain a free assistant for every 80 royal exchanges bought.  A  Titan 
Titan  2  Harmony of Thoughts  Faceless' Hive Mind playtime is increased by 10% of the playtime of all the other factions.  P(B)  Faceless 
Titan  3  Balanced Economy  Increase max mana based on the number of faction coins generated this game. Formula: $ round(2.5 * \log_{10}(1 + x))% $ where x is your Faction Coins Gained (This Game) stat.  MM  Druid 
Titan  4  Storm of Wealth  Every 5 minutes you automatically generate Faction Coins based on the amount of Gems you own.
Formula: $ round(0.05 * x) $ where x is the number of Faction Coins generated by Lightning Strike.  FC  All 
Druid  1  Silent Assistance  Animal Companions works faster.
Formula: $ floor((\sqrt{(1 + 16 * x)}  1) / 2) $ where x is your Playtime (This Game) stat in hours.  P(A)  Druid 
Druid  2  Balanced Current  Mana regeneration is increased by 1% for every 200 Stone Pillars you own.  MR  Titan 
Druid  3  Eldritch Architecture  You gain 1.25 additional max mana for every 4 Labyrinths owned.  MM  Faceless 
Druid  4  Overflowing Mana  All spell durations increased by 1% for every 1,500 max mana.  Spell Time  All 
Faceless  1  Recruitment  Gain an extra assistant every minute. Resets every hour.  A  Faceless 
Faceless  2  Mystic Maze  You gain +10 max mana for every 20 Labyrinths built.  MM  Druid 
Faceless  3  Cyclopean Army  Gain extra assistants based on your royal exchange bonus.
Formula: $ floor(2 * x^{0.5}) $ where x is your Royal Exchange Bonus.  A  Titan 
Faceless  4  Omnipresence  All factions receive a bonus based on your Hive Mind bonus.
Formula: $ (0.01*5*0.1*x^{0.75}) $ where x is current Hive Mind bonus.  P(B)  All 
Dwarf  1  Enchanted Crystals  Reduce all spells cost based on the amount of gems you own.
Formula: $ \frac {\ln {(1 + G^{1 + {\frac A {10} } }) } } {20}% $ where G is the number of gems you own and A is the number of times you ascended.  Reduc (Spell)  Angel  Dwarf 
Dwarf  2  Biased Architecture  Reduce Inn and Blacksmith cost multipliers. Reduces cost multiplier by 0.01; with no other reductions applying, the multiplier will be 1.14 instead of 1.15.  Reduc (B)  Fairy  Dwarf 
Dwarf  3  Rich Miners  Increase your Faction Coin find chance by 100% for each active spell.  FC chance  Elven  Dwarf 
Dwarf  4  Paladins  Increase Holy Light bonus based on the combined amount of Knights Jousts and Wizard Towers you own.
Formula: $ 50x^{0.35}% $ where x is the number of Knight Jousts and Wizard Towers you own.  P(click)  Dwarf 
Dwarf  5  Underground Foundation  All buildings count 20% more for all purposes.  P(B)  All 
Drow  1  Organized Crime  Increase Royal Exchange bonus by 0.025% per trophy you own.  RE bonus  Demon  Drow 
Drow  2  Dark Elegance  Increase the production of all buildings based on faction coins earned this game.
Formula: $ log^2(1 + x) $ where x is your Faction Coins Gained (This Game) stat.  P(B)  Goblin  Drow 
Drow  3  Sorcerer's Pact  Online Time (This game) is added to Offline Time (This game).  Time (Offline)  Undead  Drow 
Drow  4  Trained Assassin  Increase your Offline Time (This Game) by 1 second every 10 spells cast in this game.  Time (Offline)  Drow 
Drow  5  Shadow Mirage  A fraction of your alignment spell bonus is applied passively. Note: "Fraction" is equal to 5%.  Spell bonus  All 
Dragon  1  Sky Monarch  Mutiplicatively increase faction coin chance by 12% per Lightning Strike tier bought. Also increase PostAscension bonuses for Titan Drill and Titan Sized Walls.  FC chance  Titan  Dragon 
Dragon  2  Barkscales  Increase Stone Pillars production based on the amount of Grand Balance targets.
Formula: $ (6000 * x^{1.75}) $ where x is number of targets.
Also reduces all Spell Tier upgrade costs based on Grand Balance activity time in this game.  P(B)
(Spell)  Druid Dragon 
Dragon  3  Serpent Queller  Ascension 1 penalty from Deep Memory is removed and its bonus increased. Faction Coin find chance from Evolutive Mutation becomes multiplicative with increased effect. Formula: $ (3 * x^{0.65})% $ where x is the number of Sunken Cities you own. Formula: $ (3 * x^{0.95})% $ where x is your amount of Sunken Cities.  FC chance (minus Ascension penalty)  Faceless  Dragon 
Dragon  4  Draconstellation  Faction coins from excavations are increased based on the amount of artifacts you own.
Formula: $ x^6(%) $ where x is number of artifacts.  FC  Dragon 
Dragon  5  Ancient Incantation  Tax Collections are 20% more powerful for every spell tier you have active.  P  Any Prestige 
Dragon  6  Dracomet Vault  Gem production is passively increased over time based on the amount of artifacts you own. Resets on Abdications.
Formula: $ 0.0015 * t^{0.7} * a $ where t is playtime this game in minutes, a is artifacts found.  Gems  All 
Realm Grinder 

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