Total War: Warhammer III

This is a level 5 building that you can only built in the settlement "The Writhing Fortress". It is in the Province called "The Blood Marshes". This province is in the middle of the deamon lands. Since you start in the nortwest, you will have to go quite a bit to the right, so it is unlikely you will be able to built this before the endgame.

Once you conquered the settlement, try to conquer the whole province so you can built as many growth producing building ("Opulent Antiquity" and "Pellucid Globe"). Also remember to use the Pleasurable Act "Pleasure Hunt". Those can be activated by clicking on the button to the lower left corner of the screen, where you can also see the control level of the province and other such information.