Recently had an Apocalypse game with oponent using combined Eldar and necrons VS Tau and Imperial knights. Really2 tough battle.
Necrons itself 1 obelisk and 1 tessaract is one of the main problems as all around AV14 AND living metal!
I did try it. Yep. RIPTIDE WING novacharge IA to str 9 ordnance...2 rounds of shootings from riptide hailfire.....well didnt do sh*t! We're talking super heavies here. All those wasted shots str9 ordnance.
LUCKILY, i have TAUNAR SUPREMACY at my disposal
Hes the one that bring them down. D blast.
So my conclusion vs AV14 superheavies is Taunar. Multiple str 9 or 8 shots, with ordance or melta(which doesnt affect superheavies) wont do nothin but drop a few HP at best.
Another option is stormsurge. Bring the Heavy Retribution cadre. BUT bring drone net as well coz you those markerlights to boost to str D and up yr BS. At best you 8 str D shoots from 4 destroyer missiles from each SS.
Any other option would be the usual crisis bomb but really vs AV14....you that much luck. Vs AV14 non super heavies prob melta will do the job but like i said superheavies not affected by melta shots.
Againts all other vehicles with low rear armor, OSC is the solution. 2 models of Ghostkeel as a unit in OSC formation will easily get the job done.