I killed it on Hard, took me about an hour and a half but here is the strategy:- Potions: Make sure you have 1 Swallow, 1-2 Blizzards, and Spectre Oil. Spectre Oil isn't necessary (I did it without but the game froze right after I killed the beast), but it helps immensely.- Apply the Spectre Oil to your sword while still inside the cave. It also helps to make sure your toxicity level is 0.-Head outside and click through cutscene.-As soon as you hear the battle drums, pause the game. Click on the icon to get your sword out and unpause, then pause again immediately. Make sure you have the AARD spell selected, and the group fighting style selected. Drink a Blizzard potion and then unpause.-By the time you've finished the Blizzard potion, dogs should be surrounding the Witch. Cast AARD on her and the surrounding dogs will fall. Then start attacking one of the standing dogs with group style.-Get in a combo or two, and as the dogs and Beast surround you, hop over them (stay away from the Beast!!). Then attack a dog, get one or two combos in, hop over in the opposite direction of where the beast is, repeat. What happens during this is that you weaken the Beast down without directly confronting him. If you confront him directly you will be paralyzed. You need to stay away from him and weaken him only by attacking the other dogs with group mode. If you were hurt in the initial attack, drink a Swallow.-Once all of the dogs have been killed, run around until more appear. In the meantime, if the Beast attacks the Witch, knock him off with AARD. Repeat this and the above process.After a while, you should have weakened the Beast enough that your AARD spell will knock him down and keep him on the ground for a bit. When this happens, switch to Strong fighting style and take him out while he's on the ground.Took me about 30 loads to figure this strategy out, but once I had it down it was easy. If you're having a hard time, try it out, best of luck!