니다 is the end of the formal polite ending -습니다 / -ㅂ니다, the one used in announcements and public speech. It was picked out here mostly from lines that misspell it, on purpose or otherwise — 감사하니다 for 감사합니다, 수고하셨스니다, 떡라면 먹을 거니다 — plus a few sageuk-style 드리옵니다. On its own it is not a meaningful unit, and these lines do not establish one.
The examples below did not fully pin this one down — read them before relying on the entry above.