Vyxal (generating Vyxal), 2 bytes, ~\$10^{303}\$

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Simple number compression builtin. Generates a Vyxal compressed number in base 255. Exceeds the 128 byte output limit at \$10^{303}\$, but can go up to \$10^{308}\$ if the ceiling is raised to 130 bytes.

Vyxal, 3 bytes ~\$10^{305}\$

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Thanks to emanresu A for 2 more orders of magnitude

Simple number compression builtin, then chop off the last char. Generates a Vyxal compressed number in base 255. Exceeds the 128 byte output limit at \$10^{305}\$, but can go up to \$10^{308}\$ if the ceiling is raised to 130 bytes.