Three Virtues

The S rank ability faceless is rather interesting. Essentially this makes it so that one cannot recall exactly what Rosetta looks like no matter how hard they try. They also cannot recall details of what occured during the meeting. They can recall the outcome, that vast destruction happened, that deals were made (and what those deals were), but they cannot remember exactly what happened, such as the exact words used or what caused the destruction. Other people involved, such as another of her guild members, will be remembered. It is merely Rosetta this effects. She can choose not to invoke this effect should she wish the encounter, and herself, to be remembered. H ranks are less seduced by this and if they try hard enough then they will recall what happened.

The A rank ability sensory deprivation is highly useful.  What this essentially does is hide her magic aura to such an extent that without having to try to compress her magic power or anything like that she will appear as a C rank class mage. A clever mage might notice that her aura seems to radiate further than a normal C rank and make a judgement based on that and this is more likely the higher rank the person (H ranks will rarely be fooled by this for example). This also means if she is charging up a powerful attack it won't seem to be using as much magic because it appears to be just a C rank spell when in reality it could be any rank.

The S rank class ability red heart provides a permanent HP buff whilst the gemstone is in place. This HP buff is equal to an extra 140hp(20% of her total health) meaning she can take a lot more punishment before going down. This works by providing energy to the nanites that form her body to essentially boost their durability so they are harder to break

The A rank class ability blue heart provides a permanent MP buff whilst the gemstone is in place. This MP buff basically boosts the user's mp from 100% to 110%. This is done by providing energy to the nanites that form her body allowing them to exert a greater amount of energy before shutting down.

The user whilst wearing Grace is able to lift much heavier objects than ever before via this S rank ability. They are able to lift an object up to 1000 times their own weight, much like an ant. She is able to throw this. However, anything thrown by her that hits an object will only receive her rank in heavy unarmed melee damage (as will the target). This is mostly a plot device, but it would, for example allow her to toss a much larger opponent. This is said to come from being able to more gracefully use her nanites to enhance the capability.

The graceful fist is something that effects how melee damage works for her.

Normally for a mage damage is calculated thusly:

Normal - 100% damage, 100% speed
Light - 50% damage, 150% speed
Heavy - 150% damage, 50% speed

However, in the case of Rosetta, when wearing Grace and utilising this A rank ability, this is altered to the following:

Normal - 100% damage, 100% speed
Light - 80% damage, 160% speed
Heavy - 160% damage, 80% speed

This means her light attacks are faster and more damaging than someone equal to her and her heavy attacks are faster and more damaging than someone equal to her whilst her normal attacks remain the same.