Falsifying (sage ability)
The practice of either accurately duplicating designs for pre-existing heraldry, in order to employ its use in nefarious purposes, or the creation of non-existent proof of lineage.
In the case of the former, while many signs or sigils are easily reproduced, many are not. To reproduce a symbol accurately enough that it would pass the inspection of an authority of heirarchy requires the aid of an expert. While the ability does not confer any craftmaking skills that would be necessary in creating a forged item (such as a seal or a coin), engaging a heraldic expert would be a necessity if the forgery were to withstand inspection. Work that is prepared with the help of an expert will withstand even scruitiny from an authority – but the truth of the manufacture will reveal itself to an expert – though this will take 2-8 days of thorough inspection and research to reveal itself (unless sufficient magic is employed).
Falsifying proof of lineage is likely to be more successful, so long as the forged details of descendence do not make themselves known to the family or families involved. The character's knowledge of heraldry will enable to character to postulate a logical but false relation to an existing royal or noble family, detailing how the patents and heraldic symbols for that individual ought to appear. These can then be drawn out and manufactured by a competent crafter. Such documentation would fool even another expert, unless that expert happened to be of the falsified nationality or be in continuous communication with the actual family. Depending on the geographical location where the falsification is taking place, this may be very unlikely.
As already stated, the ability is available to experts.
See Also,
Heraldic Registration (sage ability)
Heraldry, Signs & Sigils (sage study)