The Imperial Senate has the power to commission important projects or great works of construction that will benefit the Empire. Any Imperial citizen can make use of mithril, weirwood or white granite they have purchased to improve a resource they own. But regardless of how much wealth they possess, no citizen can recruit their own army or simply order the construction of a great work unless they have been granted the authority to do so by a Senate motion.
Most commissions automatically result in the creation of a new Imperial title, for example raising a new army causes the creation of a new Imperial general. Creating this title is an integral part of the commission and does not require a second motion to be considered by the Senate.