Fricative loss: intervocalic *-b-, *-d-, and *-g- were lost except before front vowels
- *jalaga → *jálā → *jě̏la → jała "elm"
- *jabat → *jā → *jě̏ → je "oars"
- Intervocalic *-b- before front vowels become *-w-
- *häbäs → *éˀwes → *jève → jewie "withers"
- Otherwise, *-b-, *-d-, and *-g retain their phonological quality after consonants
- *lamba → *lámba → *lǫ̏bo → łębo "sheep"
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Secondary stress becomes the primary stress, and the old stress lost
- Proto-Finnic *ármastàdak → Early Proto-Cernelian *armastā́ˀ → Late Proto-Cernelian *ormostà → Modern Cernelian romosta "to love"
- The secondary stress is expected from non-final odd-numbered syllables
- The secondary stress pattern still remained after fricative loss (see above for examples)
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*h-, *-h, and *-k become early Proto-Cernelian glottalized acute -ˀ (final *-h caused lengthening of the preceding vowel)
- *habukka → *áuˀka → *ùko → uko "hawk"
- *hameh → *áˀmē → *ámě → amie "shirt"
- *raha → *ráˀa → *rȏ → ro "money"
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Proto-Finnic front vowels *e, *ö, *ü → *e, *e, *i
- *räüstäs → *rèistes → *rȉste → rzyście
- This development also followed by fronting of *o after front vowels to *ö
- *näko, alternative *näkö → *néke → *nȅče → niecze
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Proto-Finnic *c → *s
- *kecrä → *késre → *čȅre → czerze "wheel"
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Proto-Finnic short *o → *a, but *oo → *ō
- *ilo → *íla → *jьlõ → iłó "joy"
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Ruki sound law: -s- becomes -š- after velars, -i-, -r-, and -u- except preceding consonants
- *ükci → *iˀsi → *iˀši → *jь̀šь → isz "one"
- *karcina → *káršina → *kȍršьno → krószno "pen of animals"
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Increasing stress phonemicization
- Stress in medial open syllables moved one syllable to the left
- *ínhimìnen → *iníˀminen → jьnьmьnę̃ → iniemnią "person"
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