Molten Core is the ultimate ability of Torbjorn, the Swedish engineer hero in Blizzard's team shooter Overwatch, released in 2016. Activating it overheats his forge hammer and lets him shoot pools of molten slag that damage enemies standing in them. The shouted callout became familiar to players from ranked and casual matches, then moved into highlight reels, streams and edited memes where the line alone signals an ultimate is coming. It remains popular because Overwatch fans instantly connect the delivery, accent and phrase with Torbjorn's turret building playstyle.