@cool_lad I'm not really sure what to do with tomb blades quite honestly. Doom scythes are terrors, and quite capable of cutting through hulls like all other necron strike craft in void configuration, so they could keep their fighter bomber role, but it doesn't quite feel right having them be not as effective as fighters. Likewise, tomb blades don't feel right in a troop transfer role, being single man vehicles, and that's the point of night scythes anyways, though given that the reason night scythes are used in initial waves is due to the fact the main force doesn't have exacting coordinates to teleport yet it seems more likely they would just teleport given how known the battlefield should be. They could take the fighter-bomber role, given they are explicitly mentioned as being equipped with hull cutters and being fighters simultaneously, but again with better bombers and fighters why even bother? Maybe use them as scouts?
Doing necron fighters right will be hard. Their are supremely agile, explicitly mentioned as being faster than other fighters, and possess very skilled pilots. Its mentioned the night scythe pilots are expected to, beyond making tactical decisions when in its scouting role on non necron planets, supposed to examine natives and preform biopsies and probes on the inhabitants, even testing for suitability for apotheosis, sometime doing this to entire towns at a time while being stealthy. This suggests even the personnel carrier pilots have both scientific and some form of spec ops training, and when compared to the fact most of the doom scythe's mass is actually datastacks with plans and tactics for the pilot to review, enough that when its mission is outside parameters it can look through these and simulate billions of strategies in nanoseconds, means that they are definitely some of the best pilots in the setting, in the best craft, and that's not even the "non-necrons are driven insane by the sound of scythe engines" thing, which is definitely a factor in a battle filled with strike craft. Tomb blades are interesting, as we don't know how much the ground ones are modified for that role, and they are very modular (the shadowloom and nebulascope both being extremely useful refits, but the fact they are one of the few necron craft that the necrontyr will just slap extra armor on sometimes is perhaps the most interesting bit about them) and come in flights of dozens to multiple hundreds, which would kill more than a few computers. They are capable of manuevers that would make most pilots black out or just die to. And thats not mentioning the utter monsters that are the necron bombers. Still, necron carriers would certainly help the lack of versatility the fleet currently suffers from, and were something I was asking for since alpha day one.