Aura of the Beholder is a must have for training, especially at lower levels, where you can barely take two hits from the monster you're training on. It takes off a lot of stress for maintaining your HP at Berserk level; tops off your HP so that you can get your maximum HP below your Berserk limit without carrying a tonne of different pots and removes the need for you to try to figure out which pot to use all the time. This may not sound like a significant advantage, but you will think differently if you spend 3+ hours training. Having to concentrate so much on your HP gets very tiresome and it is the main drawback of the Dark Knight class, in my opinion. Anything to help with that is a godsend, and I've found that Aura helped me a lot.
Achilles might be useful for bosses, but I honestly don't know. I'm level 156, and I fight Horned Tail almost every day. Achilles will probably be one of the last skills on my list to max.
Achilles might be useful for bosses, but I honestly don't know. I'm level 156, and I fight Horned Tail almost every day. Achilles will probably be one of the last skills on my list to max.