Okay, so what happens with Supernatural Attribute (X) is that whenever something with it makes a Test (which includes combat, so Supernatural Agility X adds to Close Combat Tests to attack and parry and Acrobatics Tests to dodge), it adds the X number towards the success pool on top of whatever it rolled with it’s D20s, so they could succeed despite rolling no successes. As well, Supernatural Strength and Awareness adds static damage equal to X, so a Razide’s Supernatural Strength 4 adds +4 damage on top of any melee damage they do.
As far as how Slave To Symmetry (X) works, it gives a Dark Symmetry Point to the pool whenever something with it spends (X) amount of Momentum. As for the Razide making a CC attack, Close Combat Tests are mainly tied to Agility, not Strength, so if the Razide is using Strength for it’s CC attacks something strange is happening with it.
So as an example if the Razide in question made an Athletics Test to rip down a door (D2, since it’s tough solid wood), it’d auto generate 4 successes from Supernatural Strength and then it rolled 1 success with it’s 2D20, therefore generating 5 successes, and would be able to spend 3 Momentum, which it spends all of and then creates 1 DSP thanks to it’s Slave to Symmetry 2. It could have made 2 DSP if it had gotten 6 successes instead and spent 4 Momentum, but it didn’t because the dice hated it.