Sphere of Foresight, one of the ancient artifacts available in the game
Ancient artifacts are unique items which give large permanent bonuses. They are obtained in the Tavern either by drawing an artifact card or by crafting one with 5 Primordial Elements. You get the artifacts in a random order. Each artifact has a level and a rarity.
Enchanting
Artifacts can have one of eight rarities (Epic, Legendary, Mythic, Titan, Angel, Celestial, Immortal and Primordial). The rarity of an artifact can be increased by enchanting it with golden keys. The enchantment cost starts at 20 keys and increases by 5 keys for the first two rarity upgrades, and then increases by 10 keys for the final rarity upgrade. Each rarity generally doubles the effect of the artifact attributes. But it increases by ×4 for health and armor attributes, by 0.5% for resource regenerations, the alchemy perk and the librarian perk, by 0.2% for the explorer perk and by 5% for wWar machine attributes.
Medal
Rarity
Enchantment cost
Effect
Epic
Standard rarity so no added effect
Legendary
20 golden keys
×4 for health/armor
+0.5% for regenerations
+0.5% for alchemy/librarian
+0.2% for explorer
+5% for war machine attributes
×2 for any other artifact attributes
Mythic
25 golden keys
Titan
30 golden keys
Angel
30 golden keys
Celestial
30 golden keys
Immortal
30 golden keys
Primordial
40 golden keys
All upgrades are multiplicative between different artifacts and with other upgrades of the same type.
Upgrading
The level of an artifact can be increased with twilight hourglasses until a level cap is reached which depends on the rarity of the artifact. The upgrade cost starts at 5 twilight hourglasses per level for epic artifacts and increases by 1 hourglass for each higher rarity up to a cap of 10 hourglasses. Each level upgrade increases all attributes of the artifact, except for regenerations, alchemy/librarian/explorer and war machine attributes, multiplicatively by 6% (12.36% for health and armor). The maximum level of an artifact is 100.
Rarity
Level cap
Cost per level
Effect per level
Epic
5
5 twilight hourglasses
+12.36% for health/armor
none for regenerations
none for alchemy/librarian/explorer
none for war machine attributes
+6% for any other artifact attributes
Legendary
15
6 twilight hourglasses
Mythic
25
7 twilight hourglasses
Titan
40
8 twilight hourglasses
Angel
55
9 twilight hourglasses
Celestial
70
10 twilight hourglasses
Immortal
85
10 twilight hourglasses
Primordial
100
10 twilight hourglasses
All upgrades are multiplicative between different artifacts and with other upgrades of the same type.