The specific presentation of a spell can be customized. Customization of a Spell Presentation/Manifestation can introduce no additional effects which require saves or trigger secondary damage or harm in any direct or indirect manner. It is mostly to add theatrics, remove theatrics, or to change a specific damage type. Research, experimentation, and evincing on-the-fly typically require Mystic Practice check(s).
With clever use, it can play on superstitions and/or fears which can make it easier for follow-ups such as fast-talking, persuasion, suggestion, charm, or deception leading to additional Conditions.
Recorded Materials: Formulae for these are most often recorded in something akin to a Primer (Occult Primer, etc.) due to their unique/personalized nature and approach.