Sevennan is the language of The Seventh Seal Guild. It was devised as a means of conducting guild affairs without the worry of other non-affiliated persons prying in on guild business.
It is a constructed language based on Orcish sentence structure but borrowing its entimology heavily from Thalassian and various druidic languages, with other influences apparent.
Etris Roseshield, The inventor of the language, chose languages that she was most familar with as the basis for Sevennan's lexography.
Orcish was chosen as the foundation of the language so that if would be relatively easy to learn when taught. This contrasts with its obscure Druidic and Thalassian entimology which means that without correct tutition, learning the language would be difficult.