Hello everybody,
i stunk . at karyan boss.
I've try at least fifty times. I cut four tentacoles, I start the QTE and sometimes i fullfill the bar, but after a swap I always fall down. and try again and again and always fall down .
any solution please ?

Try not getting on the tentacle ride, and just let the 4th tentacle hit you instead, have quen on and make sure you have a full health bar, then you'll just have to destroy the 4th tentacle the same way you did the other 3. After the 4th tentacle is destroyed, you'll have to run up the stone wall that fell, trying to not get hit by the other tentacles.

,didn;t work thanks you
but it didn't work
i fall down again