So reckless with your dark angels
You just charged straight at a necron gunline with everything, heading straight into rapid fire range. The rhino's were wasted points really, should have just footslogged the
dev's, infact, they would have provided the perfect counter to the wraiths, so if you kept them back they could have countered the wraiths perfectly.
Using the cover to your advantage by blocking line of sight to your bikes and possible the land raider till the neurone line got closer also would have been favourable to you. You needed to be the one that rapid fired first in the game, especially against necrons with how durable they are.
Still, I admire your boldness haha.