Self-sacrifice.
Many Rakshasa Perfected Spirits and Kings shook their heads and sighed when they saw that.
As the young man had said, so what if the sacrificial secret skill was successful?
Throughout the long and countless years, many clansmen had also tried to sacrifice their lives to summon experts of the Nine Nether.
However, when they cultivated in this world, they were always suppressed by the sealing power of this place and their cultivation realms could never break through to the Emperor realm.
Therefore, even if a Rakshasa King sacrificed himself, the clansman he could summon was only at the Grotto-heaven realm as well and could not defend against the killing methods of the living beings from the Blessed Heaven World!
Even Grotto-heaven realm Kings were useless. Even if Ah Yu could successfully summon a Grade 9 Heaven Essence realm clansman, what was the use?
It still could not change anything. It would just be another soul.