"This magic is a double-edged sword for someone like me who needs to command troops on the front line, but for you who are immune to mental interference, it's a strong trump card,"
Yes.
The side effects of this magic are ineffective against Reiger, who can ward off mental interference.
In other words, in Reiger's hands, this magic is simply a pure enhancement.
This is the berserk magic held by Finn Timna—the "Fierce Demon Spear."
Reiger had only used this magic once before, during the bloody battle on the eighth layer of the Nasalik Underground Tomb.
Now, he activated the magic again, letting the frenzy surge from within his chest, and his eyes turned a deep red.
"Aaaaaaaaahhhhhhhhhhhhhh!"
Unable to suppress the frenzy in his heart, Reiger roared out loud.
Under this roar, powerful enough to shake all of Salisbury, Reiger's speed increased drastically, and for the first time, he caught up with Lancelot, who was in an accelerated state.
"...!"