Acorus
Acorus grows in humid soil on the shores of lakes and ponds. <Event craft> Collect Acorus to create Clear Acorus Water, Wheel Rice Cake and Red Bean Rice Cake. If you are lucky, you will get Golden Acorus.
Not dropped by monsters.
Cannot be spoiled.
The chances are official (x1). On servers with x10, x100 and higher rates, drop and spoil come more often.