According to the Journal of the Watcher of the Brax Arena:
For the sake of future Watchers, I wish to set down now a set of instructions for correctly operating the Arena's magically enchanted devices (as the last Watcher can no longer tell you, it does not pay to invoke the Queen's wrath by making careless mistakes).
Powered by direct taps to the nearby mana node, the stone pillars of the Arena regulate and channel the flow of mana to our purposes. Each outer pillar may be raised or lowered and all five pillars may be activated or deactivated. Only when all pillars are raised and activated will the mana be directed in just the right way to trigger the summoning of an undead horde for the Queen's sacrificial ceremonies, as well as raising the central stands to a safe height above the ensuing mayhem.
Note that under normal circumstances, raising and activating all the pillars is as simple as pulling all nine control levers (although it should be noted that activation levers will only activate that pillar if it is already raised). However, the magicks which power the levers seem to be somewhat volatile; when left unmaintained for long periods of time, the effects of the levers seem to cross with each other. It is important, therefore, that you insist that one of the Queen's Order continually re-enchant them. Otherwise, you may wake up one day as one of the undead warriors of the arena!
(Life as an undead warrior is not the most glamorous of professions, I promise you.)