Bureaucrats grant sysop powers to elected administrators and rollback rights to trusted users. While bureaucrats are largely similar to administrators in general article editing, their opinions are almost always considered in important policy decisions that affect the whole site, as well as determining consensus in difficult cases. Other than that, the role of a bureaucrat is similar to the role of the administrator.
Another segment of the bureaucrats' role is that their votes must be unanimous in order for a user to be approved as a sysop.
A log of changes to user rights is maintained at Special:Log/rights.
WarWiki's bureaucrats have the power to veto stuff. In order for a bureaucrat to use their veto, they must mark the action clearly as such and preferrably to add a link to this page. If a bureaucrat votes "no/oppose" on something, it does not constitute as veto unless it's marked as such.