Really nice to see the humble spear get its due here. Not often we get to see humanity's oldest weapon used properly instead of just as a punching bag for the flashier sword-wielders.
...but on the flip side of good, here we go again with a so-called "useless power" that is obviously way more powerful than it has any right to be. And she just kept quiet about it on her prior journey?
The Grace power seems like it would be exponentially more powerful with bigger groups, as there are more variables to twist in your favor.