This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
嶈 combines 山 (mountain) with 將, which likely contributes the sound. The exact historical development is uncertain.
The top 山 suggests a mountain, but the overall meaning is unclear. Imagine a mountain with a general (將) standing on it, but the kanji itself has no established meaning.
For ソウ, imagine a mountain so tall it touches the soul (ソウ) of the sky. The soul sound cues ソウ while the mountain shape anchors the kanji.