In magical and esoteric contexts, there are a few terms that might capture the concept of the ultimate sphere or grandest scale:

1. The All: This term is often used to denote the totality of existence, encompassing everything that is, was, or ever will be. It suggests a unified, interconnected whole that transcends individual concepts of space, time, and dimension.
2. The Absolute: This refers to the ultimate reality, the unconditioned and infinite source of all being. It is often described as beyond any concepts or limitations, transcending all dualities and distinctions.
3. The Source: This term emphasizes the origin or wellspring of all creation. It can be understood as a divine energy or consciousness that pervades and animates the entire universe.
4. The One: Similar to the Absolute, this term emphasizes the unity and interconnectedness of all things. It suggests that everything in the universe is ultimately derived from a single source and is interconnected on a fundamental level.
5. The Infinite: This term highlights the boundless and limitless nature of the ultimate reality. It suggests that there are no boundaries or limitations to the scope of existence, and that everything is ultimately contained within an infinite whole.
6. The Godhead: This term is often used in theistic traditions to refer to the supreme being or ultimate divine reality. It can encompass various concepts of God, Goddess, or a pantheon of deities, depending on the specific tradition.
7. The Great Mystery: This term acknowledges the unknowable and ineffable nature of the ultimate reality. It suggests that there are aspects of existence that are beyond human comprehension and can only be experienced through direct spiritual encounter.

The choice of term often depends on the specific philosophical or spiritual context. Some traditions might emphasize the impersonal nature of the ultimate reality, while others might focus on its divine or personal aspects. Ultimately, the choice of term is less important than the understanding that it represents a concept that transcends ordinary human experience and encompasses the entirety of existence.