Upgrade Companions Special Event! Ends 12/5/2017 3:59PM (PST).
Between 11/30/2017 4:00 PM and 12/5/2017 3:59 PM (PST), if you use [Upgrade Companion] in the [Tavern], you are guaranteed to receive an experience bonus.
Maximize your exp gains by using the [Metal Minion] and [Metal Minion Λ]! Upgrade those companions that assist in your adventures!