The game could not find LWJGL's Vulkan module
Applies to the game client.
What it looks like in your log
java.lang.NoClassDefFoundError: org/lwjgl/vulkan/VK
What causes it
Minecraft 26.x asks LWJGL for its Vulkan classes at startup. They were not on the classpath, so the game died before the window opened. The launcher built this version's library list without lwjgl-vulkan; your graphics driver and mods are not involved.
How to fix it
Update the launcher (Modrinth App, Prism, MultiMC, or the official one) to a build that knows this Minecraft version, then reinstall the version so it downloads the missing lwjgl-vulkan library. If a custom launcher profile or a modpack pins an old LWJGL, remove that override.
Not sure this is your problem? Paste your log and Roastd will tell you which of these it actually matched, and what else it found.
Check your own log