Quick question on her trait:

If she's using the diagonal option, and it looks like this:
............ _
...............|
........
....
S

...line of fire is blocked because both walls meet in the corner. By destroying only one wall, LoF is restored, so would her power allow her to destroy both, or just one?

thanks

I say both.

I hope so, just to simplify things.

Would the blocking terrain leave a debris marker, or would her power destroy that too?

I would rule it as both. Because of the wording of the power, specifically "All objects, walls, or squares of blocking terrain that would hinder or block line of fire to that square are destroyed." All being the keyword here. Considering one of the walls alone wouldn't block it, only both, so both are destroyed.

that seems like sound reasoning. thanks.

I was just reading this power and wondering this too.