Holding an experience gem [Spectrum] in either hand or offhand with any amount of levels in, while also having any amount of xp yourself means that the Rosa arcana (im using the floating version) will generate mana without taking it off the player indefinitely.
#AOF6 Botania/Spectrum infinite mana dupe
weary belfry
sacred socket
I will look into it and either fix it on Spectrum's side or open an issue at Botania