New elf-only spell: Obscure
Simulates a land+castle transfer between two targets for 3-6 hours. I guess it'd have to do KS fuckery too because someone will just end up taking Seeker-esque snapshots to defeat this. Fails could result in different targets, maybe the KS didnt get obscured but the land/castles did.
You make this spell easy enough to cast and there's going to be mass confusion lol. I guess it makes truesight mandatory(?), that'd be the next hurdle. Maybe it just needs to cost more but my opinion on TS is likely unpopular, I think it's OP to have such information in a game of army decimation.