From Guild Wars 2 Wiki
Memory Gobbler is an item that consumes Memories of Battle in exchange for Timeless Bags of Items. The converter can be used up to five times a day.“
Double-click to feed 50 Memories of Battle. The converter can be used five times a day.
— In-game description
|Skirmish Supervisor||Eternal Battlegrounds; Blue Alpine Borderlands; Green Alpine Borderlands; Red Desert Borderlands; Edge of the Mists; Obsidian Sanctum (zone)||+|