4th combo point

[mhroney69]

How high does your melee level have to be to get the 4th combo point? I'm at melee level 12 and still only have 3 combo points.

[ApothecariesWait]

I earned it when my melee skill hit 13.

It was initially driving me mad finding this because it seems to be tied specifically to the xp level in the skill not just the value. For example there is a ring in chapter 8 that boosts melee skill by 5 so even though I spent the last three chapters with a melee skill greater than 13 the combo point never unlocked. On a subsequent playthrough the combo point unlocked after getting enough melee xp to reach 13 without using the ring.