Blue Post
Original thread hosted on Blizzard's official forums.
Season 13 Ladder - Mosaic Runeword Disabled
View on Blizzard forums:
https://us.forums.blizzard.com/en/d2r/t/season-13-ladder-mosaic-runeword-disabled/172344/1
The Mosaic Runeword has been disabled for Ladder Season 13, which is intentional to prevent graphics issue which can lead to crashes (this was mentioned in our Known Issues Thread).
It can still be crafted offline, in non-ladder play. Thanks for your patience!