Hi. If u want the trick to avoid fault in solo raid boss? Here is the trick I do.
Don't touch enemy with normal attack at start. Use abilitys and your damage will be normal again. Use aquaman and hit his 3rd three times. And keep using normals attacks or abilitys till the end. (I my self stop attacking when there are 15 sec left and press go back or Def. But I have a question. Is it safe to use on arena?