Act.
A group of commands in Asta that, as a whole, creates a special effect that a single spell, enchantment, or magic, can't actually pull off.
Of the 36 Acts currently existing in Acts, and something that most definitely won't ever change, he used the twelfth one.
A peculiar barrier that had the ability to empty out a particular type of energy from the enclosed area. And paragraph 1 of this was Mana.
So, the barrier that suddenly appeared after the weird golden arrow surrounded by peculiar magic suddenly appeared in the middle of tens of experienced mages.
The appearance itself was shocking as the arrow had neglected their magic detection and just from looking at the complex structure of the magic surrounding the arrow, they can tell any attack from them will be for naught.
This caused chaos in these mages and even before they moved away from the arrow, a barrier that was covering the entire half of the training ground, their mana started sucking out of them.
