Next up on the chain of techniques was obviously Needle Cloak. Since Arisu could use her hair offensively, she needed to also learn to use it defensively as well, so that she could actually withstand attacks. The interesting thing about this technique was that it created a powerful defense of just the hair alone, while still allowing for a counter attack. Increased strength and defensive techniques meant Arisu didn't have to dedicate her training to her own physical prowess or defense, which let her focus more and more on the important things.
Arisu formed the Boar seal, and her hair grew around her, covering her body. She used the Lion's Mane to beat down on the hair with some of her other hair limbs, just to see how it handled physical damage, and to her surprise, the cloak didn't even budge slightly. She sent a hair whip at the tree, just to compare, and it took a large chunk out of the trunk, which meant it had quite a deal of power behind it. That would serve her purposes quite well.
Retracting the Needle Cloak, Arisu's hair shifted back to its normal state. She only had one more thing to learn currently, and that was how to project the hair out like needles. It shouldn't really be that difficult, especially considering she had a technique that already converted her Black Receiver Rods into needles, and had techniques to launch items as weapons as well, so it just made sense to her that it wouldn't be that difficult for her to replicate it as a hair technique that utilized her own hair as a weapon.
The real trick would be seeing if she could combine it with something else later on, like the Assimilate All Creation technique. Would her hair take on the properties of the material as well? Because then, perhaps, she could use her techniques to artificially enhance her attacks and defenses even further. But first, she needed to finish learning the Needle Hell technique. It wasn't a particularly difficult technique. Forming the Ox seal, Arisu hardened her hair, and focused more on the individual hairs, sending them a signal to launch at the tree.
Immediately, as if firing a barrage of senbon, her hair launched tons of hair at the tree, which bit into it, volleying through it and tearing out massive chunks as they slammed into it at massive speeds and with significant force as well. Arisu smiled. She was pretty well ready for fights, but she wasn't quite done with her training just yet either. There was still more the girl had to learn before she was truly unbeatable.
-Learning Needle Hell and Needle Cloak