User blog comment:MisterWoodhouse/The Future of Gamepedia/@comment-47870776-20210111075908/@comment-26339491-20210111092323

Gwent wiki was not migrated to Fandom like you describe. The Gamepedia wiki was archived (i.e. locked for editing but still open for reading) as part of our Crossover project that aims to unite split communities on just one active wiki, on whichever platform there's already more content, activity and/or traffic. Later, the wiki's domain was migrated to fandom.com for reasons described here.

So you can still access the Gwent wiki on Gamepedia, with the Gamepedia layout, just under a "fandom.com" domain.