You used to have a spell, which for argument hit for:
Rank 1 (at level 10), 10 points.
Rank 2 (at level 20), 20 points.
Rank 3 (at level 30), 30 points.

Now you get the only rank (at level 10), and it hits for:
At level 10, 10 points.
At level 11, 11 points.
At level 20, 20 points.
At level 27, 27 points.

So rather then having an ability that hits very hard compared to the previous rank, you have an ability that scales with level, for a gradual improvement as you level.