2. How to play solo raids with high damage:
2.a. Unlike league raids, you need not wait till 59 secs are left in solo raids.
You can start using specials right after the first Powerbar fills up.
But don't make it obvious, start by using special 1, then once 3 bars are filled, use sp2 and so on.
2.b. Again do not use basic attacks, at least not till 59 secs are left. Yes, you can use basic attacks once only 59 secs are left. But don't abuse it or you'll get the error.
2.c. You can use tagin damage too.
2.d. solo raids are very unpredictable, sometimes you get error even for Armor piercing abilities or combo hit bonus too. Sometimes even for critical hits.
So it's all about trail and error, keeping in mind the above points.
2.e. Use King of Atlantis Aquaman, 3rd special for 1 hit kill with no error at all. Even if used at the beginning. (Do not use in league raids)
This trick does not work against heroes who can block and reflect damage, specially Mythic Wonder Woman.
This trick also does not work against Darksied.