Fuse-Up Event

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Usually, the Fuse rate for companions is fixed at:
*8 Novice = 1 Expert
*8 Expert = 1 Elite
*8 Elite = 1 Master
*4 Master = 1 Master
However, during the Fuse-Up event, fusing Novices and Experts has a small and larger (but still small) chance to get a Master companion, respectively. Novices also have a chance to give Elites upon fusion. <Br />
Elite and Master units see no overall rate change for fusing, but depending on the event certain companions have a higher chance of being the result of fusion. <Br /> 
So, it is suggested that you only fuse Novices but keep all your Expert units in inventory (might have to increase its capacity) as you wait for Fuse-Up event. <Br />
It happens every few months and the Tavern is a great place to get Expert companions from.