Artefacts are found in the Black Market of the Runeblade iPhone application. They are items that help your Heroine advance more quickly through generations. Artefacts are purchased with Crystals, with each Artefact you purchase costing additional Crystals, so make sure to buy the ones you really want early on. Artefacts can also be upgraded with Crystals to enhance their power.
Note: You can only use Crystals you have Retired with to purchase and upgrade Artefacts.
As the Arai withdrew, power magical items were left behind. People have been hoarding and trading these Artefacts without understanding their full potential, yet in the hands of the Chosen they can be used for the benefit of all mankind.
If you feel that you are no longer benefiting from an Artefact and want to regain some of your Crystals, you can sell an Artefact back to the Black Market for 75% of the Crystals you used to upgrade it, plus 75% of the last Artefact you purchased.
Example: You buy the Mana Cube as your first Artefact for 1 Crystal and upgrade it to level 9 for a total of 44 Crystals. Over time you purchase 4 other Artefacts, with the last one costing 16 Crystals to buy and your next Artefact costing 35 Crystals. If you sell the Mana Cube now, you will receive 75% of the 44 you spent on upgrades and 75% of the last 16 Crystals you spent on the last Artefact you bought. So you will receive 33 + 12 = 45 Crystals and your next Artefact will now only cost 16 Crystals again.
Before buying Artefacts, become familiar with all of the Artefact abilities and decide which ones you want to invest in for early generations, mid generations and late generations. Each Artefact you buy costs progressively more (see chart below), so don't just buy all of them early.