Aethergoop

Aethergoop is a substance with 3 main uses: spent to purchase artifacts, transforming artifacts that have alternate appearances, and crafting certain trade skill items. (See HELP AETHERGOOP CRAFTING)

Obtaining Aethergoop

Out-of-game sources

Lusternia.com tends to have different promotional packages each month and some include aethergoop.

In-game sources

Aethergoop is a potential reward from spending an iron coin to spin the Wheel of Tzaraziko.
Wonder Cornucopia can gift 500 aethergoop or a grimy wonder crystal once an in-game year.
Rubbing completed Genie Bottle Curios will can award aethergoop.
Treasure Map Curios.
Rubbing curio pieces will either transform them into another curio or into aethergoop.

Prior to aethergoop, a similar promotional non-credit currency existed called dingbats which have since been retired from use.