Looking for feedback on a potential list here. Punch holes it in, find flaws, tell me why it won't work. Because on paper it looks hard as nails.
Librarian - power field generator (95)
+company command -standard of devastation (165)
9 tactical marines (bolters) 126
8 tactical marines (bolters) 112
3 ravenwing bikers - 2x melta (100)
3 ravenwing bikers - 2x melta (100)
Land raider crusader - multi melta (260)
Land raider crusader - multi melta (260)
Land raider crusader - multi melta (260)
Knight errant (370)
1848/1850
Power field generator works again from inside vehicles. Crusaders unleash anti infantry pain with dakka banner while being very resilient themselves with a 4++. Bikes can go snipe vehicles/hide behind the av14 wall/drop 24 more twin linked bolter shots. Errant nukes vehicles and assaults stuff that gets close. Only weakness here being 2 objective secured units. Anything you'd change or swap?