Though every expert from the Battle Saint Family was elite, when faced with hundreds of thousands, even millions or more demons capable of contending with gods, they were still swallowed whole. From the moment Ye Xiwen unleashed the Demon Summoning Banner to the moment they were engulfed, only a short while had passed.
After devouring dozens of Late Stage Sage Realm experts, quite a few demons within the Demon Summoning Banner advanced again. Many had entered the Sage Realm, but to Ye Xiwen's regret, not a single one evolved into the Peak Sage Realm once more.
What truly made Ye Xiwen's scalp tingle was that in such a brief span of time, his mana had already been completely drained. One had to know that his mana was far more abundant than that of an ordinary Peak Sage Realm expert, yet it had been exhausted so quickly.
The Demon Summoning Banner devoured mana at a terrifying rate. Controlling so many demons was not as simple as releasing them and being done with it. Each one might consume only a trace of mana, but when their numbers accumulated to such a degree, it became utterly frightening.
Still, the Demon Summoning Banner's power was frighteningly immense as well; it was a matter of gains and losses. Once Ye Xiwen's cultivation grew deeper in the future, this problem should be eased. Fortunately, this was not the complete Demon Summoning Banner. Otherwise, even with Ye Xiwen's current mana, he would have been sucked dry into a desiccated corpse in an instant. This was a magical artifact forged by the legendary Demon Monarch.
These Battle Saint Family experts had also contributed wealth worth over a hundred billion God Source to Ye Xiwen. Their riches, accumulated over countless years, had now all fallen into Ye Xiwen's hands.