Battle royale in Skyforge has been temporarily disabled, but won’t be outright removed.
The team cites their intent to continue to improve the mode as their reason to disable it,
“In 2018, we launched the Battle Royale mode, and many of you enjoyed it. Unfortunately, it's not as popular today. Seeing as users don't seem to be interested in the current state of Battle Royale, we decided to temporarily disable the mode so we can work on improving it.”
However, they continue, explaining that while they’ll temporarily disable the mode, they’re not going to outright remove it from the game,
“We don't plan on completely removing Battle Royale. At this time, we are thinking about turning it into a separate event that would add variety to the gameplay and give immortals an opportunity to earn extra rewards.”
The mode will be temporarily disabled when the anniversary update begins to roll out. You’ll still receive rewards for the current season however.