Alas we only have the general spoken Queekish for communication between Clans, not any of the Clan-specific dialects.
We do have almost the entire written language (excepting magic vocabulary).
This should allow things like:
- Spying on meetings between different factions
- intercepting written communication between clans and inside of clans
- forging communication both between clans and internal of clans
- stealing any written down plans or books
All things which were not possible at all before. If we had the specific clan-dialects, there would be more, but we don't.