You see a magic wall.
Location
Paradox Tower, when using a Magic Wall Rune
Notes
This wall appears on Open PvP worlds, on Optional PvP worlds the Magic Wall (Neutral) will occur.
History
Before Updates/10.55 it looked like this:
Paradox Tower, when using a Magic Wall Rune
This wall appears on Open PvP worlds, on Optional PvP worlds the Magic Wall (Neutral) will occur.
Before Updates/10.55 it looked like this: