Monster Purge Gift Box
Monster Purge Gift Box is a other (consumable) in GMS v271. Sells to NPCs for 1 mesos.
You'll get more rewards if you open this box at higher levels. Levels 30, 70, and 100 are the tiers for everyone. There's a special tier at Lv.50 and above for Dual Blades, Cannoneers, Evan, Mercedes, Phantom, Luminous, Battle Mages, Wild Hunters, and Mechanics.