Hei Yue made a strangled noise. "Father! You never taught me that one!"
"Because you weren't ready," Hei Xuan said simply. "He is."
Yun Lintian accepted the second slip, his expression turning grave as he absorbed its contents. Unlike the first technique, this one was immediately dangerous — not to the enemy, but to the user. It taught how to become a living void, to erase one's own existence temporarily to avoid any attack.
The risks were obvious. Stay in that state too long, and you might never return.
Without hesitation, Yun Lintian began practicing. His form flickered, then vanished completely - not invisibility, but true non-existence. Even Hei Xuan's divine senses couldn't detect him.
Five breaths passed. Ten...
Just as concern began to show on Hei Yue's face, Yun Lintian reappeared, his face slightly pale but otherwise unharmed.
"Twenty breaths is the safe limit," he assessed. "Beyond that risks permanent dissolution."
