Ainz Negative Energy Touch 1

Ainz gracefully rose to his feet, dusting himself off. He did not seem at all bothered at being sent flying.
In contrast, the Martial Lord’s movements were extremely sluggish.
Ainz chuckled.
This was the best way the show could have gone.
Ainz returned to his original position, amidst a cacophony of noise. The Martial Lord asked in doubt:
“Wh-what is this? Poison… no, what is this?”
“I did not break the rules. This is a proper contest. That said, this is far beyond the word ‘poison.’ My touch can infuse negative energy into an opponent’s body. However, a Troll’s regeneration should be able to heal that.”
Ainz made the same gesture he used when touching the Martial Lord, opening and closing his fingers.
“However, I have another ability in addition to that. I can inflict physical ability damage by touch. Thus, your strength and dexterity have been reduced. I don’t think you can heal that, can you?”

[...]

“…The ability penalties I inflict will not heal with time, you know. I will shave away at your physical stats bit by bit, until I deliver the final blow with this staff, understood? Well, if you do, then let’s continue.”
Ainz stepped forward, and the Martial Lord slowly took a stance.
He could not see the Martial Lord’s face because of his helmet. Was he laughing to himself, or was he growing anxious?
The latter, I hope…
Ainz moved his left hand, the one which was not holding his staff. The Martial Lord shifted in response. It would seem he was very wary of it.
The Martial Lord must be thinking that all he needed to do was worry about
the left hand.
That was it. During Ainz’s experiments, he found that he could initiate touch
attacks with any part of his body. If he felt like it, he could even use a headbutt
to do so.

- Overlord; Vol 10; Chapter 3