Which MS Class Skills do you envy the most?

You once you get to a high enough level, heaven's hammer will be your roar

Except that unlike Roar it can't be cast more than once per minute, even maxed, so it's pretty crappy for the luring purposes I use Roar for (which sometimes take 2-3 consecutive casts to hit everything I need it to), and for mass slaughter of low level stuff (roar hits 3 platforms at HHG for example).