A pair of incense furnaces or burners I've seen on one of my favorite manhwas 'Martial Peak'. These furnaces came from the black wordless book left behind by The Legendary Great Demon God, first cultivator in the Tong Xuan Realm to reach the realm of Saint King. They work by burning herbs the smoke of which will cause one's body to lose strength and therefore forcing one to exert more power which improves cultivation.

Great for both Eevee and Cycles!

Enjoy!