>send my Necron Deathmarks (12 models on ultra) up on a ridge to snipe Guillieman
>there's a pebble just barely blocking the LoF of one on the very left
>while I'm not looking, the entire unit marches down the hill to get a better shot when an Outrider unit (8 models on ultra) spots them and demolishes them
I'm going back to Mechanicus until they fix how the AI handles LoS.