Blades of Time

Some enemies have powerful attacks that you can counter. The main enemy you'll meet that you can counter is the zombies with shields. They have a regular attack which is pretty quick but they have a much slower attack that can be countered. When they use it, RB will appear over their head. When it does, all you need to do is face it and then press RB. If you aren't facing it the counter won't work, so bear that in mind.

An ideal place to do this would be at the very first encounter in the Brutal Lands. There are 5 zombies with shields here. Counter as many of them as possible until you die or there is only one zombie left, then die or restart the checkpoint. Then repeat.