I don't know that area well or the Elias family but I do know the Church at Caerhun. St Mary's is built in the corner of an old Roman fort and at this time of the year the graves are covered in Snowdrops (see photo)
The Burial records can be found at the Conwy Archives in Lloyd Street Llandudno and they have a list and location of each grave that has a headstone. They are easy to check as they are also listed alphabetically.
e-mail archifau.archives@conwy.gov.uk website
http://www.conwy.gov.uk/archives As regards the death notice from " The Abbey LLaarwel" I have never heard of it and it is obviously spelt incorrectly as you don't get two "a's" together in our Welsh alphabet.
If you can post the newspaper article on the marriage of Ernest and Sarah on here then I'm sure that it can be translated for you