In the first years of the regency, the tension between the Yellow Banners faction and Suksaha was kept in check by the even handed Sonin and thus the four ministers maintained a relatively peaceful and efficient working relationship. But the dynamics of the regency began to change as Sonin's health deteriorated due to old age. As Sonin gradually took more time off, Oboi monopolized decision making by dominating the indecisive Ebilun and worked to sideline Suksaha during policy discussions especially on issues concerning welfare of the Manchu Eight Banners . By 1667 when Sonin realized he did not have long to live, he tried a last-ditch effort to restore balance to the regency and neutralize Oboi's rapidly expanding power clique by petitioning the then 14-year-old Kangxi Emperor to assume personal rule ahead of schedule. Thus Kangxi formerly took over the reins of power in an ascension ceremony on August 25, 1667, a month after Sonin's death. This was followed by an official decree technically downgrading the three remaining ministers to the status of "advisers" (佐政大臣) while still remaining at their posts. However even with the formal authority of office, the young Kangxi Emperor found it difficult to curb the growing power of Oboi.