Synthesomancy

Above: The Keys of Existence.

Synthesomancy acts as a harmonizing meta-language encapsulating and transcending the Four Base Languages of Iconic, within whose syntax coalesce to form an internally coherent system, much like the way fundamental forces in physics seek unification at higher energy states. It grants the ability to navigate and manipulate the intersecting realms and potentials that the base languages focus on.
Quantaphysics takes the role of "modality" in Synthesomancy. It provides the mechanisms by which events can happen, bringing in the elements of probability, certainty, necessity, potentiality, and obligation. It's the "could," "should," and "would" in the language, giving it its malleability and adaptability, allowing one to indicate the likeliness or moral weight of an event or action, opening up realms of possibility, duty, and speculation.
Mentaphonics serves as the "perspective" through which an action or concept is understood. It brings relativity, nuance, and the subjectivity of consciousness into play, enabling manipulation of perception and meaning. A single Synthesomantic sentence can thus be loaded with several layers of mental landscapes and multiple levels of interpretation.
Anachronology is incorporated as the temporal or "tense" aspect. It allows for the manipulation of events across time, effectively giving you the ability to utter things in a way that affects past, present, and future simultaneously.
Corporeality is integrated as the "aspect," referring to the physical or material state of actions or events. It specifies if an action is completed, ongoing, or yet to begin, but in a physical sense. It determines the material makeup of what is being discussed—whether it is solid, fluid, energetic, or something more abstract.
These components come together to form a complex language capable of describing and influencing multi-dimensional events in a way that the individual base languages cannot. Like a symphony of interlocking melodies and harmonies, Synthesomancy is greater than the sum of its parts, and forming a crucial stepping stone to grasp the profundities of Iconic, preparing one for the infinite complexities and subtleties therein.
It is typically used by the The Vocru to express highly detailed scenarios that consider both external and internal realities; complex chains of cause and effect, along with their moral or practical implications; and/or subjective experiences and phenomena, articulated in objective temporal and physical terms.
The more elements one seeks to incorporate, the more precise but also more complex the expression becomes, which could lead to misunderstandings if not adequately contextualized. For texts written at this level of meaning, the Vocru teach a special form of Exegesis to their Heirs to ensure they've correctly grasped the concepts involved.
The language can otherwise be understood analytically as follows:

Phonology

Synthesomancy's phonological structure encompasses unique tonal variations that encapsulate harmonics of the other languages. Think of it as a chord progression that incorporates the scales of Quantaphysics, Mentaphonics, Anachronology, and Corporeality.

Morphology

Words in Synthesomancy morph fluidly, allowing for compound constructions that encapsulate the domains of the other languages. For instance, a single word might be a blend of temporal, elemental, mental, and physical phenomena. This allows for intricate expressions and commands with layers of simultaneous meaning.

Syntax

The language uses a flexible syntax that permits circular, linear, or even fractal sentence structures. These structures mimic the various dimensions and perspectives encompassed by the base languages, enabling Synthesomantic commands to influence multiple domains concurrently.

Semantics

In Synthesomancy, semantics involve a hyper-contextuality: words have not just one meaning but a plethora of meanings that are context-dependent and relationally defined. One must understand the terms of the Four Base Languages to grasp the intricate semantics of a Synthesomantic utterance.

Pragmatics

The language aims for maximal impact with minimal articulation. Because it commands multiple domains, its utterances are highly situation-dependent. For example, the same phrase could heal or harm, create or destroy, depending on the intentions and understanding of the one who speaks it.

Writing System

Writing in Synthesomancy is like a condensed version of crafting Runes: The Glyphs employed are multidimensional shapes, sometimes overlaid or interlaced. Each one has a base form associated with one of the Four Base Languages, modified with accents, dots, or lines that indicate the influences of the other languages. Crafting Glyphs involves a ceremonial process where the Glyph is "sounded out" phonologically, then traced morphologically, all while maintaining a meditative focus on the intended semantic and pragmatic meanings.
To master Synthesomancy is to find the keystone of the primary Philosophy Game and to understand the architecture of the multiverse. It allows for a new way of perceiving and manipulating reality, building bridges across domains that were previously isolated or even antithetical.