Work Orders should be your first priority to upgrade because these upgrades will help you get the most resources as soon as possible and unlock many more items for the game to progress as well as storyline.
I highly recommend you focus on upgrading enhancement first rather than the decorations.
| Purchase | Description | Price | Prerequisites |
|---|---|---|---|
| Fountain Chamber, Tartarus | Added Chamber: Restore some Health amidst the gloom. (Adds the Fountain Chamber to Tartarus) | 0 Gemstone | |
| Underworld Fountains, Purified | Underworld Renovation: Fountains provide +10% more Health than usual. | 20 Gemstones |
|
| Underworld Fountains, Holy | Underworld Renovation: Fountains provide +20% more Health than usual. | 40 Gemstones |
|
| Fountain Chamber, Asphodel | Added Chamber: Restore some Health amid the searing heat. (Adds the Fountain Chamber to Asphodel) | 20 Gemstones |
|
| Fountain Chamber, Elysium | Added Chamber: Restore some Health amid the lush environs. (Adds the Fountain Chamber to Elysium) | 40 Gemstones |
|
| Plunder, Lesser | Underworld Renovation: Chambers may contain an Infernal Trove. Trove rewards: - 100 Gold - 100 Health - 50 Darkness - 25 Gemstone | 10 Gemstones | |
| Plunder, Greater | Underworld Renovation: Each Infernal Trove contains more. Trove rewards: - 125 Gold - 125 Health - 100 Darkness - 50 Gemstone | 150 Gemstones |
|
| Plunder, Superior | Underworld Renovation: Each Infernal Trove contains even more. Trove rewards: - 125 Gold - 125 Health - 100 Darkness - 50 Gemstone | 500 Gemstones |
|
| Urns of Wealth, Lesser | Underworld Renovation: Chambers may contain urns with 5 Gold. | 40 Gemstones |
|
| Urns of Wealth, Greater | Underworld Renovation: Chambers may contain urns with 10 Gold. | 80 Gemstones |
|
| Urns of Wealth, Superior | Underworld Renovation: Chambers may contain urns with 15 Gold. | 120 Gemstones |
|
| Keepsake Collection, Regional | Underworld Renovation: Switch Keepsakes between Underworld regions. | 10 Gemstones |
|
| Fated List of Minor Prophecies | Special Item: The Fates reward whomever moves things along... Unlock Fated List of Minor Prophecies | 20 Gemstones |
|
| Codex Index | Special Item: Update the Codex with a handy list of Boons for each Olympian. Unlock Codex Index | 50 Gemstones |
|
| Extremer Measures | Pact Stipulation: Unlocks the final rank of Extreme Measures ... if you dare. | 100 Gemstones |
|
| Contractor's Desk, Deluxe | Special Item: Give the House Contractor a break (and new jobs...) | 2 Diamonds |
|
| Pitch-Black Darkness | Underworld Renovation: Claiming Darkness chamber rewards gives you +5 Health. | 3 Diamonds |
|
| Fated Keys | Underworld Renovation: Claiming Chthonic Key chamber rewards gives you +1 Fated Authority / Fated Persuasion. | 3 Diamonds |
|
| Brilliant Gemstones | Underworld Renovation: Claiming Gemstone chamber rewards gives you +20 Golds. | 3 Diamonds |
|
| Vintage Nectar | Underworld Renovation: Claiming Nectar chamber rewards a random Boon +1 Lv. | 3 Diamonds |
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| Darker Thirst | Underworld Renovation: Your weapons' Dark Thirst also gives +20% Gemstone | 2 Diamonds |
|
| Vanquisher's Keep | Underworld Renovation: Awards bonus Gemstones after vanquishing Underworld Bosses. Rewards: Tartarus - Furies: 10 Gemstones Asphodel - Lernie: 20 Gemstones Elysium - Theseus, Asterius: 30 The Temple of Styx - Hades: 50 Gemstones | 4 Diamonds |
|
| Gateways, Erebus | Underworld Renovation: Chambers may contain an Infernal Gate. | 5 Diamonds |
|
| Rod of Fishing | Special Item: Scoop creatures from the Underworld's rivers... Unlock the ability to fish (fish can be used to exchange for items from the chef in the Lounge) | 1 Diamond |
|
| Court Music Stand | House Decor: Authorizes playback of music pieces from the vault. | 1 Diamond |
|
| Administrative Privilege | Special Item: (Re)authorizes entry into the administrative chamber. Requires to progress the storyline. | 2 Diamonds |
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| Court Musician's Sentence | Sealed Document: Free Orpheus from solitary confinement. | 1 Diamond |
|
| Knave-King's Sentence | Sealed Document: Free Sisyphus of an eternity of hard labor. | 4 Diamonds |
|
| Singer's Gamble | Sealed Document: Permit Orpheus to be with his muse again. | 3 Diamonds |
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| Hero's Sacrifice | Sealed Document: Allow Achilles to return to Elysium. | 5 Diamonds |
|
| Eldest Sigil Restoration | House Repair: Help Nyx by imbuing the Sigil in the Administrative Chamber. | 3,142 Darkness |
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Below is the list of decorative items that will be available after you upgraded the above items. As you can see that these items require so much money to upgrade, you should not upgrade them until you fully unlock everything else such weapons.
| Purchase | Description | Price |
|---|---|---|
| Theme, Infernal | Decorative Theme: Evokes infernal might and unbearable heat. | 10 Diamonds |
| Theme, Sonorous | Decorative Theme: Evokes soaring harmonies and inspiration. | 10 Ambrosias |
| Theme, Stygian | Decorative Theme: Evokes the grim stoicism of the Underworld. | 10 Titan Bloods |
| Theme, Lovely | Decorative Theme: Evokes certain descriptions of joy and levity. | 15 Ambrosias |
| Theme, Woodland | Decorative Theme: Evokes greenery found only on the surface. | 100 Nectars |
| Theme, Chthonic | Decorative Theme: Evokes night, darkness and the Underworld. | 200 Chthonic Keys |
| Theme, Deathly | Decorative Theme: Evokes the sheer opulence of Hades' domain. | 5000 Gemstones |
| Theme, Infinite | Decorative Theme: Evokes the abyssal profundity of Chaos. | 25000 Darkness |