User blog comment:Arbington/The Next Cycle/@comment-5267262-20120803203730/@comment-5267262-20120804110554

Overall it probably takes repeated fire to weaken/overload the kinetic barriers (to help the next bit hit) and then explosions inside the armour to down a destroyer or knock out its systems to the extent that you can easily kill it while disabling its weapons. For case point hades cannon, if you look at early in priority earth, when firing the cain it appears to home in (scripted event much?) this means that the cain has the ability to bypass the armour and time its detonation. Cains do travel quite fast so it is possible it will have enough kinetic energy to slip through shields. Hades cannons do appear to be heavily modified as the whole 'tail' section is missing, making them more vulnerable, the cannon may also be blocking them using their repear grade thanix gun (it is not a laser its upgraded thanix)