Ships and designs to counter an Awakened Ascendency

Doing my first Ironman run and I'm 50 years away from winning on points, but there is an Awakened Ascendency causing trouble with a 1.3m fleet thats just steam rolling anything that looks at it. I myself just whooped the Crisis like it was nothing but this Empire is just being annoying. I have no idea what ship comps and designs I should use because the auto design is floundering. I have all techs and got matter disintegrators from the unbidden but I dont know how to build any effect ship designs. I assume the fleets will be just 1 titan and a million battleships, but how to design them I'm screwed.