Anu's definition of 'sobeit' (provided that) follows the OED, but in his example the word appears to be used in a verbal sense, however subjunctive:

The armies of a littler folk
Shall pass you under the victor's yoke,
Sobeit a nation that trains her sons
To ride their horses and point their guns

This seems to require the reading "if it be".

Actually, the words in this week's theme are so far not conjunctions at all, but conjunctive adverbs (like "however," "therefore," "nevertheless"). Abelcandoit