End the end of the season, you drop two ranks.
There's no mention of that in this link I found on this topic, here:
Check out the overview of the changes coming to Ranked Mode on October 23rd.
www.playgwent.com
"
Ranked 2.0
You start from rank 30 and progress towards rank 1. Ranks are split into 5 pieces — if you win, you get a piece of a stained glass avatar, if you lose — you lose a piece. Winning three or more matches in a row grants you an additional piece of the avatar. Once you have all 5 pieces, you unlock that avatar.
The rank progression is as follows:
For Rank 30-26, dropping down a rank isn’t possible.
For Rank 25-15, you only drop down a rank if you lose twice in a row.
For Rank 14-8, there are no special conditions — the progression follows a linear pattern.
For Rank 7-1, there’s a linear pattern of progression, however, win streaks no longer give you two pieces of the avatar.
Once you reach level 25, fMMR becomes available and matches start affecting your Ranked score."
What's the logic of dropping two ranks at the end of the season?
I would have thought that you drop a rank once the last piece of your mosaic breaks, at the earliest. Not sure how that fits with the info "For Rank 14-8", which is where I am at now.