Upgrade Companions Special Event! Ends 4/10/2018 4:59 PM PDT.
Between 4/5/2018 5:00PM and 4/10/2018 4:59PM 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!