I don't like asking for hints but I'm thoroughly confused by this endgame.
I have a full grid, a theme, and the restoration instruction. The instruction seems vague, and it doesn't help that the obvious targets appear four times but don't stretch all the way across (so I can apply the instruction literally to the places indicated, but that's not going to help at all in the area where a thematic item is clearly intended to appear).
* My first instinct was to just bisect in two places, but that leads to nonsense glyphs in some places.
* If I choose the upper boundary each time, 4/5 columns (including the thematic one) are fine, but the first is not.
* If I choose the lower boundary, 3/5 columns are fine but the last two are not.
* If I make crenellations I can get all five columns to work (with an assumption that the second of the two long words remains intact), but I don't really see that this is indicated -- and indeed there are many up/down combinations possible in the relevant area, none of which seem more appropriate than the other.
* Perhaps a staircase is warranted, with a bisection for a run of columns not on the edge?
* A diagonal line leads to moire glyph problems.
This obstacle is a shame; I've enjoyed the journey so far (and the 10-character highlighting is very nice).