There is an exception, Grim Focus/Assassin's Will is a NB buff using magicka but the ability activated after 8 LA or HA scales off the highest stat like Ultimates and Synergies.
It would be nice to know also, as I wrote in another topic, if:
- ultimates and synergy abilities use armor or spell penetration or none
- the stamina skills dealing poison/disease/magic/elemental damage use armor penetration or spell (not every stamina skill infact deals physical dmg)
- the weapon glyphs (flame, frost, shock, poison, foulness) use spell penetration and are buffed by the stars in the Champion System (since skills and glyphs don't change values spending points in those stars)