There are two main methods of beating the Herald floor 11 abyss. The first is to do a quick speed run, which will make it at most be difficult and take around 20-30 minutes depending on your skill level. The second method would be to use the spinner item in order kill off all enemies before they reach you by doing so. This can be done if you have enough coins or time left when fighting them, though this takes more time than a quick speed run as well as being harder due to having no powerups available for yourself during battle