DOTA 2 now supports Vulkan

Valve pushed out an update that provides opt-in support for using the Vulkan graphics API of the Source 2 Engine rather than using OpenGL (or DirectX under Windows). Those interested in trying out Vulkan on Dota 2 can enable the Dota 2 Vulkan DLC and launch the game with the -vulkan switch. More details here and in the official Dota 2 announcement.