A few incorrect statements here...
Luria Nova did not initiate the Tomb Island War to destroy D'hara. The declared intent of the war was to liberate the Tomb Islands as compensation for D'hara not voluntarily making right its wrong in...blah blah old treaties and other IC reasonings. It's okay to promote propaganda ICly, but can we be somewhat objective OOCly? For my part on that, Luria Nova might've kept going against D'hara after the Tomb Islands depending on a variety of factors (long cultural hatred after all), but it might just as well have stopped to consolidate its holdings too.
D'hara, at the time of the Southern League's invasion of Luria Nova, had lost only their Paisland/Paisly/rurals regions, which they'd only recently conquered from Saffalore/Phantaria. This is hardly being left with 'barely anything' as claimed.