I recently tried to run the Ranger trait moment of clarity along with a superior sigil of paralyzation. The trait increases stun duration by 100%, the sigil by 30%.
The ranger GS5 skill has a base stun duration of 1.5s. With moment of clarity this turn to 3s. However, when adding the sigil, the duration no longer increases. I thought this may be due to some weird interaction between trait and sigil. However, as it turns out, even when not using the trait, the stun duration remains 1.5s.
Not sure if this is a known bug, but i haven’t found anything on the wiki nor forum.
Tldr: Sigil of paralyzation does not seem to work.