She is chosen by the Velikomat from among the best ocharovats in the nation during that generation and are blessed by Rurik's Pyre. To date, only one of the Velikomat's prospective choices has been rejected by the Pyre.
Once chosen, the Velikodoch serves as an apprentice to the Velikomat, but is more than simply an observer. Velikomats routinely assign tasks to the Velikodoch both to help them learn and lighten the load.
Also during their time as Velikodoch, they chose and marry their Great Husbands?. By 1712 and the rule of Anzhela Tomanovna, it had become customary for the Velikodoch to marry three husbands to assist in the running of the realm.