Bune is a great and a strong Duke, he appeareth as a dragon with three heads, the third whereof is like to a man; he speaketh with a divine voice, he maketh the dead to change their place, and divels to assemble upon the sepulchers of the dead: he greatlie inricheth a man, and maketh him eloquent and wise, answering trulie to all demands, and thirtie legions obeie him.
Johann Weyer, Pseudomonarchia Daemonum
Bune is the 26th spirit and rules over 30 legions of spirits. He is ranked as a Duke.
Bune is the demon of necromancy. He gives riches unto a man, and makes him wise. This spirit is trustworthy.
When to summon Bune?
I use the correspondences of Netzach even for Harab-Serapel:
Ruling planet: Venus
Astro hour: Venus
Paper seal colour: green
Metal seal: copper
Herb: cinnamon (my own choice)
The best day to summon Bune is a Friday as near to the full moon as possible.
You can do money spells with Bune even during the increasing moon.
I offer you a video about money magick with Bune. This video will help you to word your petitions to Bune.