Upgrade Companions Special Event! Ends 5/6/2018 4:59PM PDT.
Between 5/1/2018 5:00 PM and 5/6/2018 4:59 PM PDT, 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!