|"That's not what happened at all!"
This topic is considered non-canon because it never appeared in the TV series.
The Staff of Control is a weapon of the Serpentine in the world of Ninjago. It appears as a black and gray staff with small, slightly curved orange spikes on the end, looking somewhat like an inverted pickaxe head. It only appears in one set. Fangdam's Golden Staff is a golden version of the weapon.
According to its official description, the Staff of Control is formed from the combination of several weapons, including the wielders and the opponents. If a foe looks directly at it, they will be hypnotized into an obedient slave of the staff's wielder. Despite its power, the Staff of Control is wielded by Rattla, possibly to compensate for his low battle power as a Scout-ranked Hypnobrai.
Rattla's secret - The Staff of Control fuses the powers of all your weapons, and those of your enemy into a mind controlling, mother-of-all monsters. Don't ever look directly at it, or it will put you under the complete control of the user.