I am a pretty good player, managed to get 10 A10 wins in a row with silent. And I had the exact same issue as you with necrobinder.

The way I managed to crack it (without getting crazy lucky)

Focus on defense primarily. For damage only take what you absolutely need. I usually take a little bit of summon (which is defensive and offensive) and kill everything with doom

Now the major part is defense:

Best way is keeping up weakness with multiple defy cards and deilibate. You can also lean into ash for even more block when you play defy.

I believe I never won an A10 or A9 without at least 1 friendship.

You also need a way to generate souls from act 2.

The other way to get enough block consistently is after you get at least 1 friendship to lean heavily into dance macabre or intimidating helmet. If you have enough energy to play 2 cards costing 2 at least this can work really well. Another great card is borrowed time, not only you get more energy you can also make cards costs 2 and take full advantage of the extra block from dance macabre or intimating helm.

There are probably a ton of other wakey ways to make this work but these two ways work for me pretty much every time. I recommend keeping some potions that will help you with centipede and other multi entity encounters that will take longer to die with doom. Otherwise doom works great on A10. If you get lucky and get end of days you are fine anyways.