C2 · Near-native control
You understand almost everything you hear or read, including irony and dense literary or technical prose. You speak with precision and a conscious control of style, and you can rebuild an argument from several sources. This is not the same as passing for a native. Deep local references, wordplay, and extreme dialects still mark a difference. There are no beginner topics left. What is trained is control: the exact word, the chosen tone, and the effect of a sentence.
Exit. Understand almost everything an educated speaker produces in public, and choose the effect of your own sentences. The accent does not have to disappear.