Just a little FYI for beastlords. I parsed beastlord slows as a level 50 caster.
Drowsy is 22%
Languid Pace is 27%
Sha's Lethary is 40%
I tested Drowsy unupgraded then also after upgrading it to rank 3 and both were 22%, so upgrading doesn't make the slows better. (which would make Turgur's batshit insane so that's a good thing)