Which hero's ultimate is called 'Molten Core'?

The Overwatch hero whose ultimate is called “Molten Core” is Torbjörn.

Torbjörn Lindholm is a Swedish engineer, weapons designer, and founding member of Overwatch. His combat style revolves around building and upgrading a deployable turret, while Molten Core lets him fire pools of molten metal that damage enemies standing in them. The burning areas can also reinforce allied armor, making the ultimate useful for controlling narrow routes and protecting objectives.

The ability has changed significantly since Overwatch launched in 2016. Originally, Molten Core temporarily boosted Torbjörn and upgraded his turret to its highest level. Blizzard’s October 2018 rework removed that turret-upgrade function and made the ultimate a more direct area-denial attack. This history causes a common mix-up: older guides may describe Molten Core primarily as a turret enhancement, while newer descriptions focus on the molten projectiles and damaging pools.

Torbjörn’s engineering background is also central to his story. His fear of intelligent machines seemed paranoid before the Omnic Crisis, but his technical expertise ultimately made him an important Overwatch recruit.